eq(evalfstart(A,B),1,[evalfentryin(A,B)],[]).
eq(evalfreturnin(A,B),1,[evalfstop(A,B)],[]).
eq(evalfentryin(A,B),1,[evalfbb3in(B,A,C,D,E),loop_cont_evalfbb3in(D,E)],[C=0]).
eq(evalfentryin(A,B),1,[evalfbb3in(B,A,C,D,E)],[C=1]).
eq(loop_cont_evalfbb3in(A,B),0,[evalfreturnin(A,B)],[]).
eq(evalfbb3in(A,B,C,D,E),1,[evalfbbin(A,B,C,D,E)],[B>=1,254>=B]).
eq(evalfbbin(A,B,C,D,E),1,[evalfbb1in(A,B,C,D,E)],[0>=A+1]).
eq(evalfbbin(A,B,C,D,E),1,[evalfbb1in(A,B,C,D,E)],[A>=1]).
eq(evalfbbin(A,B,C,D,E),1,[evalfbb2in(A,B,C,D,E)],[A=0]).
eq(evalfbb1in(A,B,C,D,E),1,[evalfbb3in(A,B+1,C,D,E)],[]).
eq(evalfbb2in(A,B,C,D,E),1,[evalfbb3in(A,B-1,C,D,E)],[]).
eq(evalfbb3in(A,B,C,A,B),1,[],[C=0,0>=B]).
eq(evalfbb3in(A,B+1,C,A,B+1),0,[],[C=1,B>=0]).
eq(evalfbb3in(A,B,C,A,B),1,[],[C=0,B>=255]).
eq(evalfbb3in(A,B,C,A,B),0,[],[C=1,255>=B+1]).