abcx1cx1cx1cbax12.1cbax1cx1cx1abcx1cbcx1'11cx1abcx1cbabcx1'cbax1cx1cbcx1'x1'x1'AProVEAProVE Commit ID: 794c25de1cacf0d048858bcd21c9a779e1221865 marcel 20200619 unpublished dirty Statistics for single proof: 100.00 % (2 real / 0 unknown / 0 assumptions / 2 total proof steps)http://aprove.informatik.rwth-aachen.deJohnDoe