active zeros mark cons 0 zeros active U11 tt L mark U12 tt L active U12 tt L mark s length L active length nil mark 0 active length cons N L mark U11 tt L mark zeros active zeros mark cons X1 X2 active cons mark X1 X2 mark 0 active 0 mark U11 X1 X2 active U11 mark X1 X2 mark tt active tt mark U12 X1 X2 active U12 mark X1 X2 mark s X active s mark X mark length X active length mark X mark nil active nil cons mark X1 X2 cons X1 X2 cons X1 mark X2 cons X1 X2 cons active X1 X2 cons X1 X2 cons X1 active X2 cons X1 X2 U11 mark X1 X2 U11 X1 X2 U11 X1 mark X2 U11 X1 X2 U11 active X1 X2 U11 X1 X2 U11 X1 active X2 U11 X1 X2 U12 mark X1 X2 U12 X1 X2 U12 X1 mark X2 U12 X1 X2 U12 active X1 X2 U12 X1 X2 U12 X1 active X2 U12 X1 X2 s mark X s X s active X s X length mark X length X length active X length X active 1 zeros 0 mark 1 cons 2 0 0 U11 2 tt 0 U12 2 s 1 length 1 nil 0 INNERMOST ./TRS/TRCSR/inn/LengthOfFiniteLists_nosorts_noand_iGM.trs