/export/starexec/sandbox/solver/bin/starexec_run_Certifiable /export/starexec/sandbox/benchmark/theBenchmark.xml /export/starexec/sandbox/output/output_files -------------------------------------------------------------------------------- MAYBE U101 tt V2 U102 isLNat activate V2 U102 tt tt U11 tt N XS U12 isLNat activate XS activate N activate XS U111 tt tt U12 tt N XS snd splitAt activate N activate XS U121 tt tt U131 tt V2 U132 isLNat activate V2 U132 tt tt U141 tt V2 U142 isLNat activate V2 U142 tt tt U151 tt V2 U152 isLNat activate V2 U152 tt tt U161 tt N cons activate N n__natsFrom s activate N U171 tt N XS U172 isLNat activate XS activate N activate XS U172 tt N XS head afterNth activate N activate XS U181 tt Y U182 isLNat activate Y activate Y U182 tt Y activate Y U191 tt XS pair nil activate XS U201 tt N X XS U202 isNatural activate X activate N activate X activate XS U202 tt N X XS U203 isLNat activate XS activate N activate X activate XS U203 tt N X XS U204 splitAt activate N activate XS activate X U204 pair YS ZS X pair cons activate X YS ZS U21 tt X Y U22 isLNat activate Y activate X U211 tt XS U212 isLNat activate XS activate XS U212 tt XS activate XS U22 tt X activate X U221 tt N XS U222 isLNat activate XS activate N activate XS U222 tt N XS fst splitAt activate N activate XS U31 tt N XS U32 isLNat activate XS activate N U32 tt N activate N U41 tt V2 U42 isLNat activate V2 U42 tt tt U51 tt V2 U52 isLNat activate V2 U52 tt tt U61 tt tt U71 tt tt U81 tt tt U91 tt tt afterNth N XS U11 isNatural N N XS fst pair X Y U21 isLNat X X Y head cons N XS U31 isNatural N N activate XS isLNat n__nil tt isLNat n__afterNth V1 V2 U41 isNatural activate V1 activate V2 isLNat n__cons V1 V2 U51 isNatural activate V1 activate V2 isLNat n__fst V1 U61 isPLNat activate V1 isLNat n__natsFrom V1 U71 isNatural activate V1 isLNat n__snd V1 U81 isPLNat activate V1 isLNat n__tail V1 U91 isLNat activate V1 isLNat n__take V1 V2 U101 isNatural activate V1 activate V2 isNatural n__0 tt isNatural n__head V1 U111 isLNat activate V1 isNatural n__s V1 U121 isNatural activate V1 isNatural n__sel V1 V2 U131 isNatural activate V1 activate V2 isPLNat n__pair V1 V2 U141 isLNat activate V1 activate V2 isPLNat n__splitAt V1 V2 U151 isNatural activate V1 activate V2 natsFrom N U161 isNatural N N sel N XS U171 isNatural N N XS snd pair X Y U181 isLNat X Y splitAt 0 XS U191 isLNat XS XS splitAt s N cons X XS U201 isNatural N N X activate XS tail cons N XS U211 isNatural N activate XS take N XS U221 isNatural N N XS natsFrom X n__natsFrom X nil n__nil afterNth X1 X2 n__afterNth X1 X2 cons X1 X2 n__cons X1 X2 fst X n__fst X snd X n__snd X tail X n__tail X take X1 X2 n__take X1 X2 0 n__0 head X n__head X s X n__s X sel X1 X2 n__sel X1 X2 pair X1 X2 n__pair X1 X2 splitAt X1 X2 n__splitAt X1 X2 activate n__natsFrom X natsFrom X activate n__nil nil activate n__afterNth X1 X2 afterNth X1 X2 activate n__cons X1 X2 cons X1 X2 activate n__fst X fst X activate n__snd X snd X activate n__tail X tail X activate n__take X1 X2 take X1 X2 activate n__0 0 activate n__head X head X activate n__s X s X activate n__sel X1 X2 sel X1 X2 activate n__pair X1 X2 pair X1 X2 activate n__splitAt X1 X2 splitAt X1 X2 activate X X 2.2 isLNat n__afterNth V1 V2 U41 isNatural activate V1 activate V2 isNatural n__s V1 isNatural activate V1 isNatural n__head V1 activate V1 tail cons N XS U211 isNatural N activate XS isPLNat n__splitAt V1 V2 isNatural activate V1 take N XS isNatural N isLNat n__fst V1 U61 isPLNat activate V1 U161 tt N s activate N isNatural n__head V1 isLNat activate V1 isLNat n__cons V1 V2 activate V2 U181 tt Y activate Y U202 tt N X XS activate XS isNatural n__head V1 U111 isLNat activate V1 isPLNat n__splitAt V1 V2 activate V2 isLNat n__cons V1 V2 activate V1 activate n__sel X1 X2 sel X1 X2 isPLNat n__pair V1 V2 activate V2 U202 tt N X XS activate X isLNat n__take V1 V2 activate V2 natsFrom N U161 isNatural N N U161 tt N activate N U151 tt V2 activate V2 U41 tt V2 activate V2 U181 tt Y U182 isLNat activate Y activate Y U201 tt N X XS activate XS U141 tt V2 U142 isLNat activate V2 activate n__take X1 X2 take X1 X2 activate n__pair X1 X2 pair X1 X2 isLNat n__cons V1 V2 U51 isNatural activate V1 activate V2 natsFrom N isNatural N U191 tt XS nil U211 tt XS activate XS U201 tt N X XS activate X isLNat n__cons V1 V2 isNatural activate V1 U101 tt V2 isLNat activate V2 U21 tt X Y isLNat activate Y fst pair X Y U21 isLNat X X Y U11 tt N XS U12 isLNat activate XS activate N activate XS U11 tt N XS activate N U222 tt N XS fst splitAt activate N activate XS U11 tt N XS activate XS U31 tt N XS U32 isLNat activate XS activate N U172 tt N XS afterNth activate N activate XS U211 tt XS activate XS U12 tt N XS activate N splitAt s N cons X XS activate XS sel N XS isNatural N isLNat n__fst V1 isPLNat activate V1 activate n__splitAt X1 X2 splitAt X1 X2 isLNat n__take V1 V2 activate V1 U203 tt N X XS activate X U51 tt V2 activate V2 U151 tt V2 U152 isLNat activate V2 isLNat n__natsFrom V1 activate V1 U31 tt N XS activate N isLNat n__natsFrom V1 U71 isNatural activate V1 U202 tt N X XS activate XS activate n__natsFrom X natsFrom X U211 tt XS isLNat activate XS activate n__snd X snd X U172 tt N XS activate XS U12 tt N XS splitAt activate N activate XS U202 tt N X XS isLNat activate XS isLNat n__tail V1 U91 isLNat activate V1 U201 tt N X XS U202 isNatural activate X activate N activate X activate XS U41 tt V2 isLNat activate V2 isNatural n__sel V1 V2 activate V2 U221 tt N XS activate N U171 tt N XS activate XS U222 tt N XS activate N U171 tt N XS isLNat activate XS U161 tt N activate N U202 tt N X XS activate N U41 tt V2 U42 isLNat activate V2 U131 tt V2 isLNat activate V2 isLNat n__natsFrom V1 isNatural activate V1 tail cons N XS activate XS U172 tt N XS head afterNth activate N activate XS U171 tt N XS activate XS U211 tt XS U212 isLNat activate XS activate XS isLNat n__take V1 V2 isNatural activate V1 U182 tt Y activate Y take N XS U221 isNatural N N XS U12 tt N XS activate XS head cons N XS U31 isNatural N N activate XS U51 tt V2 isLNat activate V2 U21 tt X Y activate Y tail cons N XS isNatural N U151 tt V2 isLNat activate V2 U141 tt V2 isLNat activate V2 isLNat n__tail V1 isLNat activate V1 splitAt s N cons X XS U201 isNatural N N X activate XS U172 tt N XS activate N U12 tt N XS snd splitAt activate N activate XS U221 tt N XS activate XS isNatural n__sel V1 V2 U131 isNatural activate V1 activate V2 U221 tt N XS isLNat activate XS isLNat n__take V1 V2 U101 isNatural activate V1 activate V2 U31 tt N XS isLNat activate XS fst pair X Y isLNat X U11 tt N XS activate XS U201 tt N X XS activate X activate n__tail X tail X U212 tt XS activate XS U222 tt N XS activate XS U202 tt N X XS U203 isLNat activate XS activate N activate X activate XS activate n__fst X fst X splitAt 0 XS isLNat XS activate n__afterNth X1 X2 afterNth X1 X2 isPLNat n__pair V1 V2 activate V1 U204 pair YS ZS X pair cons activate X YS ZS isLNat n__afterNth V1 V2 activate V2 U161 tt N cons activate N n__natsFrom s activate N activate n__nil nil U181 tt Y isLNat activate Y snd pair X Y isLNat X isNatural n__sel V1 V2 activate V1 U221 tt N XS activate XS U191 tt XS pair nil activate XS isPLNat n__splitAt V1 V2 U151 isNatural activate V1 activate V2 U191 tt XS activate XS U32 tt N activate N isNatural n__s V1 activate V1 U101 tt V2 U102 isLNat activate V2 snd pair X Y U181 isLNat X Y U201 tt N X XS activate N U203 tt N X XS activate N U203 tt N X XS U204 splitAt activate N activate XS activate X isPLNat n__pair V1 V2 isLNat activate V1 U181 tt Y activate Y U21 tt X Y U22 isLNat activate Y activate X U222 tt N XS splitAt activate N activate XS isLNat n__snd V1 U81 isPLNat activate V1 splitAt 0 XS U191 isLNat XS XS isLNat n__snd V1 activate V1 U203 tt N X XS splitAt activate N activate XS U221 tt N XS U222 isLNat activate XS activate N activate XS U21 tt X Y activate X U201 tt N X XS isNatural activate X U51 tt V2 U52 isLNat activate V2 isLNat n__tail V1 activate V1 U131 tt V2 U132 isLNat activate V2 isNatural n__s V1 U121 isNatural activate V1 U204 pair YS ZS X activate X isLNat n__fst V1 activate V1 splitAt s N cons X XS isNatural N isPLNat n__splitAt V1 V2 activate V1 isNatural n__sel V1 V2 isNatural activate V1 head cons N XS activate XS isLNat n__afterNth V1 V2 isNatural activate V1 U101 tt V2 activate V2 U171 tt N XS U172 isLNat activate XS activate N activate XS activate n__head X head X U22 tt X activate X activate n__s X s X sel N XS U171 isNatural N N XS isPLNat n__pair V1 V2 U141 isLNat activate V1 activate V2 U31 tt N XS activate XS U11 tt N XS isLNat activate XS activate n__cons X1 X2 cons X1 X2 activate n__0 0 U204 pair YS ZS X cons activate X YS head cons N XS isNatural N U203 tt N X XS activate XS U131 tt V2 activate V2 afterNth N XS U11 isNatural N N XS isLNat n__afterNth V1 V2 activate V1 afterNth N XS isNatural N U171 tt N XS activate N U141 tt V2 activate V2 isLNat n__snd V1 isPLNat activate V1 true U221 tt N XS activate XS isLNat n__snd V1 isPLNat activate V1 U172 tt N XS activate N U12 tt N XS snd splitAt activate N activate XS U171 tt N XS activate N U141 tt V2 activate V2 splitAt s N cons X XS U201 isNatural N N X activate XS afterNth N XS isNatural N isLNat n__tail V1 isLNat activate V1 U151 tt V2 isLNat activate V2 U141 tt V2 isLNat activate V2 isLNat n__afterNth V1 V2 activate V1 U21 tt X Y activate Y tail cons N XS isNatural N afterNth N XS U11 isNatural N N XS U51 tt V2 isLNat activate V2 U131 tt V2 activate V2 U12 tt N XS activate XS head cons N XS U31 isNatural N N activate XS U203 tt N X XS activate XS take N XS U221 isNatural N N XS head cons N XS isNatural N U182 tt Y activate Y isLNat n__take V1 V2 isNatural activate V1 U171 tt N XS activate XS U211 tt XS U212 isLNat activate XS activate XS U172 tt N XS head afterNth activate N activate XS tail cons N XS activate XS isLNat n__natsFrom V1 isNatural activate V1 U131 tt V2 isLNat activate V2 U11 tt N XS isLNat activate XS isPLNat n__pair V1 V2 U141 isLNat activate V1 activate V2 U31 tt N XS activate XS U202 tt N X XS activate N U161 tt N activate N sel N XS U171 isNatural N N XS U171 tt N XS isLNat activate XS U222 tt N XS activate N U22 tt X activate X U221 tt N XS activate N U171 tt N XS activate XS activate n__head X head X isNatural n__sel V1 V2 activate V2 U171 tt N XS U172 isLNat activate XS activate N activate XS U41 tt V2 isLNat activate V2 U101 tt V2 activate V2 U201 tt N X XS U202 isNatural activate X activate N activate X activate XS isLNat n__afterNth V1 V2 isNatural activate V1 head cons N XS activate XS U12 tt N XS splitAt activate N activate XS U202 tt N X XS isLNat activate XS isNatural n__sel V1 V2 isNatural activate V1 U172 tt N XS activate XS activate n__snd X snd X isPLNat n__splitAt V1 V2 activate V1 splitAt s N cons X XS isNatural N activate n__natsFrom X natsFrom X U211 tt XS isLNat activate XS isLNat n__fst V1 activate V1 U204 pair YS ZS X activate X U202 tt N X XS activate XS isLNat n__tail V1 activate V1 U31 tt N XS activate N U201 tt N X XS isNatural activate X isLNat n__natsFrom V1 activate V1 U21 tt X Y activate X U51 tt V2 activate V2 U203 tt N X XS activate X U221 tt N XS U222 isLNat activate XS activate N activate XS U203 tt N X XS splitAt activate N activate XS splitAt 0 XS U191 isLNat XS XS isLNat n__snd V1 activate V1 isLNat n__take V1 V2 activate V1 activate n__splitAt X1 X2 splitAt X1 X2 isLNat n__fst V1 isPLNat activate V1 splitAt s N cons X XS activate XS sel N XS isNatural N U222 tt N XS splitAt activate N activate XS U12 tt N XS activate N U181 tt Y activate Y U21 tt X Y U22 isLNat activate Y activate X U172 tt N XS afterNth activate N activate XS U211 tt XS activate XS isPLNat n__pair V1 V2 isLNat activate V1 U11 tt N XS activate XS U31 tt N XS U32 isLNat activate XS activate N U203 tt N X XS activate N U203 tt N X XS U204 splitAt activate N activate XS activate X U222 tt N XS fst splitAt activate N activate XS U201 tt N X XS activate N U11 tt N XS activate N snd pair X Y U181 isLNat X Y U11 tt N XS U12 isLNat activate XS activate N activate XS U101 tt V2 isLNat activate V2 U21 tt X Y isLNat activate Y fst pair X Y U21 isLNat X X Y isNatural n__s V1 activate V1 U201 tt N X XS activate X isLNat n__cons V1 V2 isNatural activate V1 U211 tt XS activate XS U32 tt N activate N U191 tt XS activate XS isLNat n__cons V1 V2 U51 isNatural activate V1 activate V2 natsFrom N isNatural N isPLNat n__splitAt V1 V2 U151 isNatural activate V1 activate V2 activate n__take X1 X2 take X1 X2 U181 tt Y U182 isLNat activate Y activate Y U201 tt N X XS activate XS U221 tt N XS activate XS U41 tt V2 activate V2 isNatural n__sel V1 V2 activate V1 U151 tt V2 activate V2 U181 tt Y isLNat activate Y snd pair X Y isLNat X natsFrom N U161 isNatural N N U161 tt N activate N isLNat n__take V1 V2 activate V2 isLNat n__afterNth V1 V2 activate V2 U202 tt N X XS activate X isPLNat n__pair V1 V2 activate V2 isPLNat n__pair V1 V2 activate V1 isLNat n__cons V1 V2 activate V1 activate n__sel X1 X2 sel X1 X2 activate n__afterNth X1 X2 afterNth X1 X2 isPLNat n__splitAt V1 V2 activate V2 activate n__fst X fst X splitAt 0 XS isLNat XS U222 tt N XS activate XS U202 tt N X XS U203 isLNat activate XS activate N activate X activate XS U181 tt Y activate Y U202 tt N X XS activate XS isLNat n__cons V1 V2 activate V2 U212 tt XS activate XS isNatural n__head V1 isLNat activate V1 activate n__tail X tail X U201 tt N X XS activate X U11 tt N XS activate XS take N XS isNatural N fst pair X Y isLNat X isLNat n__take V1 V2 U101 isNatural activate V1 activate V2 U31 tt N XS isLNat activate XS isPLNat n__splitAt V1 V2 isNatural activate V1 tail cons N XS U211 isNatural N activate XS U221 tt N XS isLNat activate XS isNatural n__s V1 isNatural activate V1 isNatural n__head V1 activate V1 isLNat n__afterNth V1 V2 U41 isNatural activate V1 activate V2 isNatural n__sel V1 V2 U131 isNatural activate V1 activate V2 true U201 4 1 27 2 30 3 32 4 28 0 U204 2 1 0 2 17 0 0 0 0 U32 2 2 8 0 U21 3 1 9 2 14 3 1 0 U161 2 2 4 0 U182 2 2 9 0 U11 3 1 26 2 29 3 31 0 cons 2 0 s 1 1 0 n__pair 2 1 13 2 8 0 U142 1 0 take 2 1 34330 2 34330 0 U142 1 4 U152 1 0 U181 2 1 11 2 10 0 isPLNat 1 1 1 U42 1 1 0 U91 1 1 0 U221 3 1 0 2 7597 3 7598 0 U101 2 1 32418 2 11470 0 activate 1 1 0 take 2 1 34325 2 34324 0 U71 1 4 U81 1 0 U131 2 1 0 0 U222 3 1 34327 2 1799 3 1401 0 U212 2 1 6 2 9 0 U101 2 2 34325 0 pair 2 1 13 2 8 0 fst 1 1 1 U111 1 4 U132 1 4 activate 1 1 7 U152 1 4 natsFrom 1 1 4 head 1 1 11 U121 1 0 U172 3 2 34 3 36 0 splitAt 2 1 27 2 22 0 U131 2 2 34 0 fst 1 1 4 n__nil 0 7 U52 1 0 U12 3 2 29 3 31 0 U202 4 1 28 2 30 3 32 4 28 0 n__natsFrom 1 1 4 isNatural 1 4 U222 3 1 7597 2 3774 3 23 0 n__snd 1 1 1 U201 4 2 27 3 20 4 22 0 n__s 1 1 0 n__splitAt 2 1 27 2 22 0 U42 1 0 U141 2 1 20 2 16 0 U12 3 1 32 2 31 3 31 0 U141 2 1 9 2 4 0 U171 3 1 40 2 46 3 48 0 tail 1 1 4 0 0 1 U191 2 2 21 0 n__take 2 1 34325 2 34324 0 sel 2 1 47 2 49 0 U102 1 0 U171 3 2 34 3 42 0 isLNat 1 1 9 U202 4 1 0 2 27 3 17 4 22 0 sel 2 1 44 2 43 0 s 1 0 afterNth 2 1 29 2 31 0 n__cons 2 1 4 2 0 0 U211 2 1 10 2 10 0 isPLNat 1 1 9 nil 0 7 isLNat 1 1 1 n__sel 2 1 44 2 43 0 tail 1 1 10 U182 2 2 8 0 splitAt 2 1 30 2 28 0 U151 2 1 22 0 nil 0 0 n__tail 1 1 4 afterNth 2 1 35 2 35 0 U111 1 0 U32 2 2 4 0 U221 3 1 34325 2 1800 3 34329 0 n__0 0 1 n__afterNth 2 1 29 2 31 0 U211 2 1 1 2 4 0 U203 4 1 17 2 27 3 17 4 22 0 U52 1 1 0 U61 1 1 0 U51 2 1 9 2 9 0 n__fst 1 1 1 U11 3 1 28 2 34 3 34 0 U31 3 2 9 0 head 1 1 5 snd 1 1 3 U41 2 1 6 2 32 0 cons 2 1 4 2 0 0 natsFrom 1 1 9 U102 1 1 0 snd 1 1 1 U191 2 2 24 0 U21 3 2 11 3 11 0 U81 1 1 0 U22 2 1 4 2 9 0 tt 0 4 U71 1 0 U151 2 2 13 0 isNatural 1 1 8 pair 2 0 U22 2 1 0 2 14 0 n__head 1 1 5 U51 2 2 1 0 U161 2 1 4 2 8 0 U172 3 1 44 2 43 3 43 0 U203 4 1 27 2 30 3 32 4 28 0 U212 2 2 3 0 U41 2 2 32 0 U31 3 1 6 2 10 3 10 0 U91 1 0 U132 1 0 U121 1 4 U61 1 0 U204 2 1 0 2 26 0 U181 2 1 12 2 9 0 isNatural n__s V1 isNatural activate V1 tail cons N XS U211 isNatural N activate XS U202 tt N X XS U203 isLNat activate XS activate N activate X activate XS isLNat n__cons V1 V2 U51 isNatural activate V1 activate V2 U203 tt N X XS splitAt activate N activate XS U201 tt N X XS U202 isNatural activate X activate N activate X activate XS U51 tt V2 isLNat activate V2 splitAt s N cons X XS U201 isNatural N N X activate XS U191 tt XS pair nil activate XS isNatural n__0 tt activate n__cons X1 X2 cons X1 X2 U111 tt tt U172 tt N XS head afterNth activate N activate XS U132 tt tt isPLNat n__pair V1 V2 U141 isLNat activate V1 activate V2 U101 tt V2 U102 isLNat activate V2 activate n__natsFrom X natsFrom X U11 tt N XS U12 isLNat activate XS activate N activate XS U181 tt Y U182 isLNat activate Y activate Y U203 tt N X XS U204 splitAt activate N activate XS activate X U71 tt tt snd X n__snd X activate n__0 0 U22 tt X activate X natsFrom X n__natsFrom X U201 tt N X XS U202 isNatural activate X activate N activate X activate XS U42 tt tt U182 tt Y activate Y splitAt s N cons X XS U201 isNatural N N X activate XS U221 tt N XS U222 isLNat activate XS activate N activate XS activate n__s X s X activate n__take X1 X2 take X1 X2 U52 tt tt U204 pair YS ZS X pair cons activate X YS ZS U222 tt N XS fst splitAt activate N activate XS afterNth X1 X2 n__afterNth X1 X2 isLNat n__cons V1 V2 U51 isNatural activate V1 activate V2 U12 tt N XS snd splitAt activate N activate XS head X n__head X U51 tt V2 U52 isLNat activate V2 nil n__nil U142 tt tt afterNth N XS U11 isNatural N N XS U131 tt V2 U132 isLNat activate V2 activate n__sel X1 X2 sel X1 X2 U202 tt N X XS U203 isLNat activate XS activate N activate X activate XS U212 tt XS activate XS isLNat n__take V1 V2 U101 isNatural activate V1 activate V2 isNatural n__s V1 U121 isNatural activate V1 U32 tt N activate N take N XS U221 isNatural N N XS U171 tt N XS U172 isLNat activate XS activate N activate XS activate n__snd X snd X activate n__pair X1 X2 pair X1 X2 natsFrom N U161 isNatural N N activate n__afterNth X1 X2 afterNth X1 X2 U41 tt V2 U42 isLNat activate V2 U152 tt tt tail X n__tail X isLNat n__fst V1 U61 isPLNat activate V1 activate n__nil nil activate n__fst X fst X U21 tt X Y U22 isLNat activate Y activate X take X1 X2 n__take X1 X2 U211 tt XS U212 isLNat activate XS activate XS splitAt X1 X2 n__splitAt X1 X2 sel N XS U171 isNatural N N XS U151 tt V2 U152 isLNat activate V2 U141 tt V2 U142 isLNat activate V2 U161 tt N cons activate N n__natsFrom s activate N isNatural n__head V1 U111 isLNat activate V1 activate n__splitAt X1 X2 splitAt X1 X2 fst pair X Y U21 isLNat X X Y fst X n__fst X isPLNat n__splitAt V1 V2 U151 isNatural activate V1 activate V2 splitAt 0 XS U191 isLNat XS XS U121 tt tt U91 tt tt tail cons N XS U211 isNatural N activate XS snd pair X Y U181 isLNat X Y sel X1 X2 n__sel X1 X2 pair X1 X2 n__pair X1 X2 isLNat n__tail V1 U91 isLNat activate V1 0 n__0 isNatural n__sel V1 V2 U131 isNatural activate V1 activate V2 isLNat n__snd V1 U81 isPLNat activate V1 s X n__s X activate X X U81 tt tt head cons N XS U31 isNatural N N activate XS isLNat n__nil tt isLNat n__natsFrom V1 U71 isNatural activate V1 cons X1 X2 n__cons X1 X2 activate n__tail X tail X U61 tt tt U31 tt N XS U32 isLNat activate XS activate N isLNat n__afterNth V1 V2 U41 isNatural activate V1 activate V2 activate n__head X head X U102 tt tt isLNat n__cons V1 V2 U51 isNatural activate V1 activate V2 U51 tt V2 isLNat activate V2 true Failed! NaTT certifiable-1.6