YES
by ttt2 (version ttt2 1.15)
The rewrite relation of the following TRS is considered.
| a(a(a(a(x0)))) | → | a(a(b(b(b(b(b(b(x0)))))))) | 
| b(b(a(a(x0)))) | → | b(b(b(b(c(c(x0)))))) | 
| a(a(b(b(b(b(c(c(x0)))))))) | → | a(a(a(a(a(a(b(b(x0)))))))) | 
final states:
{16, 10, 1}
transitions:
| 157 | → | 19 | 
| 322 | → | 167 | 
| 376 | → | 124 | 
| 102 | → | 164 | 
| 102 | → | 304 | 
| 102 | → | 346 | 
| 128 | → | 224 | 
| 128 | → | 232 | 
| 128 | → | 327 | 
| 128 | → | 370 | 
| 103 | → | 58 | 
| 103 | → | 18 | 
| 103 | → | 275 | 
| 103 | → | 113 | 
| 103 | → | 99 | 
| 98 | → | 122 | 
| 98 | → | 252 | 
| 10 | → | 80 | 
| 10 | → | 4 | 
| 10 | → | 3 | 
| 10 | → | 295 | 
| 10 | → | 97 | 
| 10 | → | 96 | 
| 274 | → | 24 | 
| 274 | → | 168 | 
| 387 | → | 168 | 
| 387 | → | 24 | 
| 97 | → | 166 | 
| 97 | → | 295 | 
| 129 | → | 218 | 
| 129 | → | 283 | 
| 129 | → | 319 | 
| 211 | → | 50 | 
| 119 | → | 216 | 
| 119 | → | 281 | 
| 119 | → | 306 | 
| 119 | → | 348 | 
| 276 | → | 269 | 
| 299 | → | 123 | 
| 18 | → | 58 | 
| 227 | → | 150 | 
| 120 | → | 210 | 
| 120 | → | 298 | 
| 120 | → | 344 | 
| 57 | → | 21 | 
| 333 | → | 368 | 
| 333 | → | 406 | 
| 333 | → | 410 | 
| 225 | → | 150 | 
| 347 | → | 253 | 
| 219 | → | 23 | 
| 209 | → | 50 | 
| 130 | → | 102 | 
| 99 | → | 113 | 
| 99 | → | 275 | 
| 305 | → | 123 | 
| 165 | → | 50 | 
| 101 | → | 158 | 
| 101 | → | 184 | 
| 101 | → | 321 | 
| 334 | → | 359 | 
| 334 | → | 397 | 
| 416 | → | 329 | 
| 297 | → | 170 | 
| 343 | → | 328 | 
| 79 | → | 59 | 
| 201 | → | 114 | 
| 251 | → | 233 | 
| 407 | → | 253 | 
| 172 | → | 200 | 
| 172 | → | 268 | 
| 172 | → | 381 | 
| 173 | → | 226 | 
| 173 | → | 239 | 
| 173 | → | 336 | 
| 121 | → | 18 | 
| 121 | → | 103 | 
| 337 | → | 328 | 
| 345 | → | 253 | 
| 174 | → | 101 | 
| 82 | → | 26 | 
| 2 | → | 95 | 
| 4 | → | 22 | 
| 4 | → | 80 | 
| 28 | → | 78 | 
| 258 | → | 151 | 
| 258 | → | 329 | 
| 284 | → | 185 | 
| 369 | → | 123 | 
| 66 | → | 16 | 
| 100 | → | 149 | 
| 100 | → | 250 | 
| 100 | → | 342 | 
| 335 | → | 100 | 
| 282 | → | 185 | 
| 217 | → | 23 | 
| 30 | → | 20 | 
| 240 | → | 233 | 
| 17 | → | 49 | 
| 190 | → | 60 | 
| 190 | → | 115 | 
| 360 | → | 114 | 
| 398 | → | 382 | 
| 159 | → | 23 | 
| 320 | → | 167 | 
| 203 | → | 59 | 
| 354 | → | 115 | 
| 155 | → | 208 | 
| 156 | → | 202 | 
| 238 | → | 51 | 
| 238 | → | 124 | 
| 307 | → | 167 | 
| c3(371) | → | 372 | 
| c3(411) | → | 412 | 
| c3(410) | → | 411 | 
| c3(381) | → | 382 | 
| c3(370) | → | 371 | 
| c3(349) | → | 350 | 
| c3(348) | → | 349 | 
| c3(382) | → | 383 | 
| c1(80) | → | 81 | 
| c1(81) | → | 82 | 
| b2(331) | → | 332 | 
| b2(255) | → | 256 | 
| b2(235) | → | 236 | 
| b2(117) | → | 118 | 
| b2(188) | → | 189 | 
| b2(124) | → | 125 | 
| b2(113) | → | 114 | 
| b2(167) | → | 168 | 
| b2(186) | → | 187 | 
| b2(319) | → | 320 | 
| b2(234) | → | 235 | 
| b2(115) | → | 116 | 
| b2(254) | → | 255 | 
| b2(336) | → | 337 | 
| b2(114) | → | 115 | 
| b2(123) | → | 124 | 
| b2(332) | → | 333 | 
| b2(187) | → | 188 | 
| b2(329) | → | 330 | 
| b2(270) | → | 271 | 
| b2(321) | → | 322 | 
| b2(126) | → | 127 | 
| b2(298) | → | 299 | 
| b2(125) | → | 126 | 
| b2(342) | → | 343 | 
| b2(359) | → | 360 | 
| b2(200) | → | 201 | 
| b2(273) | → | 274 | 
| b2(169) | → | 170 | 
| b2(118) | → | 119 | 
| b2(257) | → | 258 | 
| b2(236) | → | 237 | 
| b2(116) | → | 117 | 
| b2(304) | → | 305 | 
| b2(170) | → | 171 | 
| b2(306) | → | 307 | 
| b2(168) | → | 169 | 
| b2(330) | → | 331 | 
| b2(256) | → | 257 | 
| b2(166) | → | 167 | 
| b2(328) | → | 329 | 
| b2(327) | → | 328 | 
| b2(271) | → | 272 | 
| b2(189) | → | 190 | 
| b2(237) | → | 238 | 
| b2(127) | → | 128 | 
| b2(368) | → | 369 | 
| b2(171) | → | 172 | 
| b2(122) | → | 123 | 
| b2(272) | → | 273 | 
| b1(226) | → | 227 | 
| b1(151) | → | 152 | 
| b1(23) | → | 24 | 
| b1(150) | → | 151 | 
| b1(26) | → | 27 | 
| b1(218) | → | 219 | 
| b1(78) | → | 79 | 
| b1(216) | → | 217 | 
| b1(63) | → | 64 | 
| b1(59) | → | 60 | 
| b1(58) | → | 59 | 
| b1(51) | → | 52 | 
| b1(210) | → | 211 | 
| b1(95) | → | 96 | 
| b1(60) | → | 61 | 
| b1(152) | → | 153 | 
| b1(149) | → | 150 | 
| b1(158) | → | 159 | 
| b1(202) | → | 203 | 
| b1(164) | → | 165 | 
| b1(154) | → | 155 | 
| b1(25) | → | 26 | 
| b1(54) | → | 55 | 
| b1(96) | → | 97 | 
| b1(50) | → | 51 | 
| b1(208) | → | 209 | 
| b1(61) | → | 62 | 
| b1(224) | → | 225 | 
| b1(27) | → | 28 | 
| b1(49) | → | 50 | 
| b1(53) | → | 54 | 
| b1(62) | → | 63 | 
| b1(153) | → | 154 | 
| b1(24) | → | 25 | 
| b1(22) | → | 23 | 
| b1(52) | → | 53 | 
| f30 | → | 2 | 
| a0(20) | → | 21 | 
| a0(17) | → | 18 | 
| a0(9) | → | 1 | 
| a0(8) | → | 9 | 
| a0(19) | → | 20 | 
| a0(21) | → | 16 | 
| a0(18) | → | 19 | 
| a0(4) | → | 17 | 
| c2(283) | → | 284 | 
| c2(296) | → | 297 | 
| c2(406) | → | 407 | 
| c2(397) | → | 398 | 
| c2(344) | → | 345 | 
| c2(281) | → | 282 | 
| c2(269) | → | 270 | 
| c2(184) | → | 185 | 
| c2(295) | → | 296 | 
| c2(275) | → | 276 | 
| c2(239) | → | 240 | 
| c2(232) | → | 233 | 
| c2(346) | → | 347 | 
| c2(185) | → | 186 | 
| c2(250) | → | 251 | 
| c2(233) | → | 234 | 
| c2(268) | → | 269 | 
| c2(253) | → | 254 | 
| c2(252) | → | 253 | 
| a2(333) | → | 334 | 
| a2(128) | → | 129 | 
| a2(172) | → | 173 | 
| a2(120) | → | 121 | 
| a2(173) | → | 174 | 
| a2(119) | → | 120 | 
| a2(334) | → | 335 | 
| a2(129) | → | 130 | 
| c0(11) | → | 12 | 
| c0(2) | → | 11 | 
| a1(28) | → | 29 | 
| a1(56) | → | 57 | 
| a1(156) | → | 157 | 
| a1(65) | → | 66 | 
| a1(98) | → | 99 | 
| a1(64) | → | 65 | 
| a1(99) | → | 100 | 
| a1(55) | → | 56 | 
| a1(155) | → | 156 | 
| a1(100) | → | 101 | 
| a1(29) | → | 30 | 
| a1(101) | → | 102 | 
| a1(97) | → | 98 | 
| a1(102) | → | 103 | 
| b3(383) | → | 384 | 
| b3(372) | → | 373 | 
| b3(374) | → | 375 | 
| b3(415) | → | 416 | 
| b3(386) | → | 387 | 
| b3(413) | → | 414 | 
| b3(353) | → | 354 | 
| b3(385) | → | 386 | 
| b3(412) | → | 413 | 
| b3(384) | → | 385 | 
| b3(414) | → | 415 | 
| b3(351) | → | 352 | 
| b3(375) | → | 376 | 
| b3(350) | → | 351 | 
| b3(373) | → | 374 | 
| b3(352) | → | 353 | 
| b0(15) | → | 10 | 
| b0(6) | → | 7 | 
| b0(13) | → | 14 | 
| b0(5) | → | 6 | 
| b0(14) | → | 15 | 
| b0(12) | → | 13 | 
| b0(2) | → | 3 | 
| b0(3) | → | 4 | 
| b0(4) | → | 5 | 
| b0(7) | → | 8 |