U72ttslengthLU93ttconsNzeroscons0U11ttttU21ttttU31ttttU41ttU42isNatIListU42ttttU51ttU52isNatListU52ttttU61ttU62isNatIListU62ttttU71ttU72isNatU81ttnilU91ttU92isNatU92ttU93isNatisNatttisNatU11isNatListisNatU21isNatisNatIListU31isNatListisNatIListttisNatIListU41isNatisNatListttisNatListU51isNatisNatListU61isNatlengthnil0lengthconsNU71isNatListtake0ILU81isNatIListtakesMconsNU91isNatIList2.0
AProVE
20cf63ea9f01bf40524adf2af9b95e39102e7dab rene 20110328 unpublished dirty
http://aprove.informatik.rwth-aachen.de/
John
Doe