active from X mark cons X from s X active length nil mark 0 active length cons X Y mark s length1 Y active length1 X mark length X active from X from active X active cons X1 X2 cons active X1 X2 active s X s active X from mark X mark from X cons mark X1 X2 mark cons X1 X2 s mark X mark s X proper from X from proper X proper cons X1 X2 cons proper X1 proper X2 proper s X s proper X proper length X length proper X proper nil ok nil proper 0 ok 0 proper length1 X length1 proper X from ok X ok from X cons ok X1 ok X2 ok cons X1 X2 s ok X ok s X length ok X ok length X length1 ok X ok length1 X top mark X top proper X top ok X top active X 2.2 active cons X1 X2 active X1 active length cons X Y length1 Y from ok X from X proper from X from proper X proper cons X1 X2 proper X1 top ok X active X top mark X proper X proper length1 X length1 proper X length1 ok X length1 X proper cons X1 X2 cons proper X1 proper X2 active from X from s X proper cons X1 X2 proper X2 active from X cons X from s X proper length1 X proper X s mark X s X proper from X proper X top mark X top proper X from mark X from X cons mark X1 X2 cons X1 X2 active length cons X Y s length1 Y active from X active X active length1 X length X length ok X length X s ok X s X active from X s X active s X active X cons ok X1 ok X2 cons X1 X2 active from X from active X proper length X proper X proper s X s proper X active cons X1 X2 cons active X1 X2 top ok X top active X proper length X length proper X proper s X proper X active s X s active X true top ok X top active X top mark X top proper X true 2 1 cons 2 0 0 s 1 0 0 1 1 1 1 16374 length1 1 0 0 top 1 0 0 length1 1 1 1 0 0 1 19750 21675 top 1 0 0 1 0 1 0 0 proper 1 1 21674 21674 ok 1 1 21674 21674 0 0 1 1 from 1 1 29206 79801 s 1 0 0 nil 0 21674 20933 mark 1 0 0 0 1 1 2 21675 proper 1 0 0 from 1 0 0 active 1 1 1 1 cons 2 0 0 0 1 1 1 0 0 0 2 59722 58127 active 1 0 0 length 1 0 1 1 0 1 1 1 length 1 0 0 from ok X ok from X active length1 X mark length X proper nil ok nil from mark X mark from X active from X mark cons X from s X active length cons X Y mark s length1 Y proper 0 ok 0 length ok X ok length X cons ok X1 ok X2 ok cons X1 X2 proper length1 X length1 proper X length1 ok X ok length1 X active from X from active X s mark X mark s X active s X s active X s ok X ok s X proper length X length proper X proper cons X1 X2 cons proper X1 proper X2 proper from X from proper X cons mark X1 X2 mark cons X1 X2 proper s X s proper X active cons X1 X2 cons active X1 X2 active length nil mark 0 top ok X active X false top mark X proper X false proper length1 X proper X proper s X proper X proper cons X1 X2 proper X2 proper length X proper X proper cons X1 X2 proper X1 proper from X proper X true cons 2 0 s 1 1 1 length1 1 0 top 1 0 length1 1 1 16704 top 1 0 proper 1 33265 ok 1 33266 0 0 1 from 1 1 28872 s 1 0 nil 0 19095 mark 1 46797 proper 1 1 0 from 1 0 active 1 44049 cons 2 1 2 2 active 1 0 length 1 1 1 length 1 0 proper s X s proper X false proper from X from proper X false proper cons X1 X2 cons proper X1 proper X2 false proper length X length proper X false proper length1 X length1 proper X false active s X active X active from X active X active cons X1 X2 active X1 true cons 2 0 s 1 1 1 length1 1 0 top 1 0 length1 1 1 27691 top 1 0 proper 1 1 ok 1 33266 0 0 1 from 1 1 28872 s 1 0 nil 0 240 mark 1 2 proper 1 0 from 1 0 active 1 1 cons 2 1 2 2 active 1 1 0 length 1 1 1 length 1 0 active cons X1 X2 cons active X1 X2 false active s X s active X false active from X from active X false active length cons X Y s length1 Y false active length cons X Y length1 Y false length1 ok X length1 X true cons 2 0 s 1 1 1 length1 1 1 0 top 1 0 length1 1 1 1 top 1 0 proper 1 1 ok 1 1 2 0 0 34495 from 1 1 21394 s 1 0 nil 0 0 mark 1 34661 proper 1 0 from 1 0 active 1 18640 cons 2 1 2 1 active 1 0 length 1 1 26608 length 1 0 active from X cons X from s X false cons ok X1 ok X2 cons X1 X2 cons mark X1 X2 cons X1 X2 true cons 2 2 0 s 1 1 1 length1 1 0 top 1 0 length1 1 1 1 top 1 0 proper 1 1 ok 1 1 2 0 0 36560 from 1 1 56977 s 1 0 nil 0 0 mark 1 2 proper 1 0 from 1 0 active 1 1 cons 2 1 2 36337 active 1 0 length 1 1 15620 length 1 0 cons mark X1 X2 cons X1 X2 cons mark X1 X2 cons X1 X2 true cons 2 1 0 s 1 1 0 length1 1 0 top 1 0 length1 1 1 0 top 1 0 proper 1 1 ok 1 1 2 0 0 0 from 1 1 1 s 1 0 nil 0 45672 mark 1 1 2 proper 1 0 from 1 0 active 1 1 cons 2 1 2 1 active 1 0 length 1 1 0 length 1 0 active from X from s X false from mark X from X from ok X from X true cons 2 0 s 1 1 0 length1 1 0 top 1 0 length1 1 1 0 top 1 0 proper 1 1 ok 1 1 2 0 0 0 from 1 1 17525 s 1 0 nil 0 29109 mark 1 1 15048 proper 1 0 from 1 1 0 active 1 1 cons 2 1 2 1 active 1 0 length 1 1 0 length 1 0 active from X s X false active length1 X length X false length ok X length X true cons 2 0 s 1 1 0 length1 1 0 top 1 0 length1 1 1 0 top 1 0 proper 1 1 ok 1 1 2 0 0 0 from 1 1 32135 s 1 0 nil 0 1 mark 1 1 48064 proper 1 0 from 1 0 active 1 33017 cons 2 1 2 1 active 1 0 length 1 1 0 length 1 1 0 s ok X s X s mark X s X true cons 2 0 s 1 1 0 length1 1 0 top 1 0 length1 1 1 0 top 1 0 proper 1 1 ok 1 1 2 0 0 0 from 1 1 26815 s 1 1 0 nil 0 1 mark 1 1 15048 proper 1 0 from 1 0 active 1 1 cons 2 1 2 1 active 1 0 length 1 1 0 length 1 0 NaTT certifiable-1.6