afterNthNXSsndsplitAtNXSfstpairXYXheadconsNNnatsFromNconsNselNXSheadafterNthNXSsndpairXYYsplitAt0XSpairnilXSsplitAtsNconsXU11tttakeNXSfstsplitAtNXSU11ttU12splitAtNXSU12pairYSZSpairconsXZSandttXtailconsNXS2.1U11ttU11ttU12splitAtNXSU12splitAtU11ttU11ttU12splitAtU11ttAProVEunknownStatistics for single proof: 100,00 % (1 real / 0 unknown / 0 assumptions / 1 total proof steps)http://aprove.informatik.rwth-aachen.deJohnDoe