TIME: 119


SCC: 9
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Global Ranking Function: nat(1*A)

  13_loop(A,B,C) :- 13_loop(D,E,F) [1*B+ -1*E=0,1*C+ -1*F= -1,1*A+ -1*B+ -1*D=0,1*A>=1,1*B>=1]
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