YES a__eq00truea__eqsXsYa__eqXYa__eqXYfalsea__infXconsXinfsXa__take0Xnila__takesXconsYLconsYtakeXLa__lengthnil0a__lengthconsXLslengthLmarkeqX1X2a__eqX1X2markinfXa__infmarkXmarktakeX1X2a__takemarkX1markX2marklengthXa__lengthmarkXmark00marktruetruemarksXsXmarkfalsefalsemarkconsX1X2consX1X2marknilnila__eqX1X2eqX1X2a__infXinfXa__takeX1X2takeX1X2a__lengthXlengthX2.1a__eq29001true02s10false03a__inf14cons20inf10a__take27nil05take26a__length19length19mark19eq28a__eq21200true0s11false0a__inf11cons212inf11a__take212nil0take212a__length11length11mark11eq212marklengthXa__lengthmarkXa__lengthXlengthX1mark122length101a__length111AProVEAProVE Commit ID: 48fb2092695e11cc9f56e44b17a92a5f88ffb256 marcel 20180622 unpublished dirty Statistics for single proof: 100.00 % (3 real / 0 unknown / 0 assumptions / 3 total proof steps)http://aprove.informatik.rwth-aachen.deJohnDoe