2.07/0.87	YES
2.07/0.87	
2.07/0.87	Problem:
2.07/0.87	 a(a(b(b(x1)))) -> b(b(b(a(a(a(a(a(x1))))))))
2.07/0.87	
2.07/0.87	Proof:
2.07/0.87	 Bounds Processor:
2.07/0.87	  bound: 2
2.07/0.87	  enrichment: match
2.07/0.87	  automaton:
2.07/0.87	   final states: {1}
2.07/0.87	   transitions:
2.07/0.87	    b1(60) -> 61*
2.07/0.87	    b1(35) -> 36*
2.07/0.87	    b1(25) -> 26*
2.07/0.87	    b1(62) -> 63*
2.07/0.87	    b1(34) -> 35*
2.07/0.87	    b1(24) -> 25*
2.07/0.87	    b1(61) -> 62*
2.07/0.87	    b1(26) -> 27*
2.07/0.87	    b1(33) -> 34*
2.07/0.87	    a1(55) -> 56*
2.07/0.87	    a1(30) -> 31*
2.07/0.87	    a1(20) -> 21*
2.07/0.87	    a1(57) -> 58*
2.07/0.87	    a1(32) -> 33*
2.07/0.87	    a1(22) -> 23*
2.07/0.87	    a1(59) -> 60*
2.07/0.87	    a1(29) -> 30*
2.07/0.87	    a1(19) -> 20*
2.07/0.87	    a1(56) -> 57*
2.07/0.87	    a1(31) -> 32*
2.07/0.87	    a1(21) -> 22*
2.07/0.87	    a1(58) -> 59*
2.07/0.87	    a1(28) -> 29*
2.07/0.87	    a1(23) -> 24*
2.07/0.87	    b2(70) -> 71*
2.07/0.87	    b2(107) -> 108*
2.07/0.87	    b2(97) -> 98*
2.07/0.87	    b2(69) -> 70*
2.07/0.87	    b2(106) -> 107*
2.07/0.87	    b2(96) -> 97*
2.07/0.87	    b2(71) -> 72*
2.07/0.87	    b2(98) -> 99*
2.07/0.87	    b2(105) -> 106*
2.07/0.87	    a2(65) -> 66*
2.07/0.87	    a2(102) -> 103*
2.07/0.87	    a2(92) -> 93*
2.07/0.87	    a2(67) -> 68*
2.07/0.87	    a2(104) -> 105*
2.07/0.87	    a2(94) -> 95*
2.07/0.87	    a2(64) -> 65*
2.07/0.87	    a2(101) -> 102*
2.07/0.87	    a2(91) -> 92*
2.07/0.87	    a2(66) -> 67*
2.07/0.87	    a2(103) -> 104*
2.07/0.87	    a2(93) -> 94*
2.07/0.87	    a2(68) -> 69*
2.07/0.87	    a2(100) -> 101*
2.07/0.87	    a2(95) -> 96*
2.07/0.87	    f20() -> 2*
2.07/0.87	    b0(7) -> 8*
2.07/0.87	    b0(9) -> 1*
2.07/0.87	    b0(8) -> 9*
2.07/0.87	    a0(5) -> 6*
2.07/0.87	    a0(2) -> 3*
2.07/0.87	    a0(4) -> 5*
2.07/0.87	    a0(6) -> 7*
2.07/0.87	    a0(3) -> 4*
2.07/0.87	    1 -> 3,4
2.07/0.87	    8 -> 19*
2.07/0.87	    25 -> 28*
2.07/0.87	    27 -> 5,6
2.07/0.87	    33 -> 91*
2.07/0.87	    35 -> 55*
2.07/0.87	    36 -> 7*
2.07/0.87	    61 -> 64*
2.07/0.87	    63 -> 21*
2.07/0.87	    72 -> 23*
2.07/0.87	    97 -> 100*
2.07/0.87	    99 -> 57*
2.07/0.87	    108 -> 59*
2.07/0.87	  problem:
2.07/0.87	   
2.07/0.87	  Qed
2.07/0.88	EOF