TIME: 160


SCC: 5
=================================
Global Ranking Function: nat(1*A+1*B+ -1)

  8_loop(A,B) :- 8_loop(C,D) [1*A+ -1*B+1*D=0,1*A+ -1*C=0,1*D>=1]
  8_loop(A,B) :- 8_loop(C,D) [1*B+ -1*D=0,1*A+ -1*C+ -1*D=0,1*A+ -1*D>=1]
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