YES a__andttXmarkXa__plusN0markNa__plusNsMsa__plusmarkNmarkMa__xN00a__xNsMa__plusa__xmarkNmarkMmarkNmarkandX1X2a__andmarkX1X2markplusX1X2a__plusmarkX1markX2markxX1X2a__xmarkX1markX2markttttmark00marksXsmarkXa__andX1X2andX1X2a__plusX1X2plusX1X2a__xX1X2xX1X22.1a__and21tt02a__plus23004s10a__x25and21plus23x25a__and212tt0mark11a__plus21200s11a__x212and212plus212x212markandX1X2a__andmarkX1X2markplusX1X2a__plusmarkX1markX2markxX1X2a__xmarkX1markX2markttttmark00marksXsmarkXa__andX1X2andX1X2a__plusX1X2plusX1X2a__xX1X2xX1X21tt0810001mark190s161and210a__and220plus230a__plus240x250a__x270AProVEAProVE Commit ID: 48fb2092695e11cc9f56e44b17a92a5f88ffb256 marcel 20180622 unpublished dirty Statistics for single proof: 100.00 % (3 real / 0 unknown / 0 assumptions / 3 total proof steps)http://aprove.informatik.rwth-aachen.deJohnDoe