YES
by ttt2 (version ttt2 1.15)
The rewrite relation of the following TRS is considered.
| a(b(a(a(a(b(x0)))))) | → | c(c(a(x0))) | 
| c(x0) | → | b(a(a(a(b(x0))))) | 
final states:
{5, 1}
transitions:
| 157 | → | 119 | 
| 176 | → | 214 | 
| 81 | → | 26 | 
| 81 | → | 9 | 
| 271 | → | 237 | 
| 87 | → | 68 | 
| 87 | → | 35 | 
| 87 | → | 49 | 
| 80 | → | 126 | 
| 229 | → | 220 | 
| 229 | → | 175 | 
| 229 | → | 224 | 
| 229 | → | 114 | 
| 149 | → | 196 | 
| 119 | → | 79 | 
| 227 | → | 248 | 
| 3 | → | 22 | 
| 50 | → | 78 | 
| 50 | → | 226 | 
| 225 | → | 176 | 
| 219 | → | 177 | 
| 37 | → | 25 | 
| 37 | → | 8 | 
| 37 | → | 47 | 
| 37 | → | 223 | 
| 37 | → | 113 | 
| 110 | → | 174 | 
| 55 | → | 25 | 
| 55 | → | 37 | 
| 175 | → | 220 | 
| 49 | → | 35 | 
| 1 | → | 24 | 
| 1 | → | 7 | 
| 1 | → | 22 | 
| 1 | → | 3 | 
| 1 | → | 222 | 
| 1 | → | 112 | 
| 73 | → | 36 | 
| 235 | → | 278 | 
| 253 | → | 228 | 
| 79 | → | 132 | 
| 36 | → | 50 | 
| 201 | → | 150 | 
| 177 | → | 149 | 
| 21 | → | 1 | 
| 150 | → | 190 | 
| 173 | → | 118 | 
| 22 | → | 46 | 
| 237 | → | 227 | 
| 283 | → | 236 | 
| 82 | → | 148 | 
| 117 | → | 168 | 
| 4 | → | 16 | 
| 118 | → | 152 | 
| 16 | → | 34 | 
| 236 | → | 266 | 
| 137 | → | 80 | 
| 35 | → | 68 | 
| 115 | → | 48 | 
| 48 | → | 82 | 
| 47 | → | 110 | 
| 68 | → | 116 | 
| 68 | → | 234 | 
| 131 | → | 81 | 
| 195 | → | 151 | 
| 27 | → | 4 | 
| 151 | → | 117 | 
| 151 | → | 235 | 
| 228 | → | 242 | 
| 247 | → | 229 | 
| b0(9) | → | 5 | 
| b0(2) | → | 6 | 
| a3(70) | → | 71 | 
| a3(135) | → | 136 | 
| a3(53) | → | 54 | 
| a3(128) | → | 129 | 
| a3(133) | → | 134 | 
| a3(69) | → | 70 | 
| a3(84) | → | 85 | 
| a3(71) | → | 72 | 
| a3(127) | → | 128 | 
| a3(85) | → | 86 | 
| a3(111) | → | 112 | 
| a3(83) | → | 84 | 
| a3(113) | → | 114 | 
| a3(129) | → | 130 | 
| a3(116) | → | 117 | 
| a3(52) | → | 53 | 
| a3(134) | → | 135 | 
| a3(51) | → | 52 | 
| a3(112) | → | 113 | 
| c4(235) | → | 236 | 
| c4(236) | → | 237 | 
| c4(227) | → | 228 | 
| c4(175) | → | 176 | 
| c4(228) | → | 229 | 
| c4(176) | → | 177 | 
| c4(150) | → | 151 | 
| c4(149) | → | 150 | 
| c0(4) | → | 1 | 
| c0(3) | → | 4 | 
| a5(223) | → | 224 | 
| a5(197) | → | 198 | 
| a5(268) | → | 269 | 
| a5(216) | → | 217 | 
| a5(251) | → | 252 | 
| a5(280) | → | 281 | 
| a5(191) | → | 192 | 
| a5(193) | → | 194 | 
| a5(215) | → | 216 | 
| a5(249) | → | 250 | 
| a5(222) | → | 223 | 
| a5(221) | → | 222 | 
| a5(244) | → | 245 | 
| a5(269) | → | 270 | 
| a5(192) | → | 193 | 
| a5(279) | → | 280 | 
| a5(245) | → | 246 | 
| a5(199) | → | 200 | 
| a5(198) | → | 199 | 
| a5(243) | → | 244 | 
| a5(217) | → | 218 | 
| a5(281) | → | 282 | 
| a5(250) | → | 251 | 
| a5(267) | → | 268 | 
| a1(23) | → | 24 | 
| a1(19) | → | 20 | 
| a1(18) | → | 19 | 
| a1(25) | → | 26 | 
| a1(17) | → | 18 | 
| a1(24) | → | 25 | 
| b5(278) | → | 279 | 
| b5(220) | → | 221 | 
| b5(246) | → | 247 | 
| b5(248) | → | 249 | 
| b5(242) | → | 243 | 
| b5(252) | → | 253 | 
| b5(214) | → | 215 | 
| b5(200) | → | 201 | 
| b5(190) | → | 191 | 
| b5(224) | → | 225 | 
| b5(194) | → | 195 | 
| b5(270) | → | 271 | 
| b5(218) | → | 219 | 
| b5(196) | → | 197 | 
| b5(266) | → | 267 | 
| b5(282) | → | 283 | 
| c2(35) | → | 36 | 
| c2(48) | → | 49 | 
| c2(80) | → | 81 | 
| c2(79) | → | 80 | 
| c2(36) | → | 37 | 
| c2(47) | → | 48 | 
| c3(118) | → | 119 | 
| c3(117) | → | 118 | 
| a2(78) | → | 79 | 
| a2(46) | → | 47 | 
| a2(34) | → | 35 | 
| b1(26) | → | 27 | 
| b1(22) | → | 23 | 
| b1(20) | → | 21 | 
| b1(16) | → | 17 | 
| b4(156) | → | 157 | 
| b4(168) | → | 169 | 
| b4(172) | → | 173 | 
| b4(152) | → | 153 | 
| a4(154) | → | 155 | 
| a4(169) | → | 170 | 
| a4(153) | → | 154 | 
| a4(234) | → | 235 | 
| a4(148) | → | 149 | 
| a4(226) | → | 227 | 
| a4(155) | → | 156 | 
| a4(171) | → | 172 | 
| a4(170) | → | 171 | 
| a4(174) | → | 175 | 
| f30 | → | 2 | 
| b3(132) | → | 133 | 
| b3(82) | → | 83 | 
| b3(86) | → | 87 | 
| b3(50) | → | 51 | 
| b3(136) | → | 137 | 
| b3(54) | → | 55 | 
| b3(72) | → | 73 | 
| b3(110) | → | 111 | 
| b3(114) | → | 115 | 
| b3(126) | → | 127 | 
| b3(130) | → | 131 | 
| b3(68) | → | 69 | 
| a0(8) | → | 9 | 
| a0(6) | → | 7 | 
| a0(2) | → | 3 | 
| a0(7) | → | 8 |