S->aA->aaS->aaaA->aaaaab
S->aA->aaab
S->aA->aaS->aabA->aabaab
S->aA->aaS->aacA->aacaab
S->aA->abS->abaA->abaaab
S->aA->abS->abbA->abbaab
S->aA->abS->abcA->abcaab
S->aA->acS->acaA->acaaab
S->aA->acS->acbA->acbaab
S->aA->acS->accA->accaab
S->bA->baS->baaA->baaaab
S->bA->baab
S->bA->baS->babA->babaab
S->bA->baS->bacA->bacaab
S->bA->bbS->bbaA->bbaaab
S->bA->bbS->bbbA->bbbaab
S->bA->bbS->bbcA->bbcaab
S->bA->bcS->bcaA->bcaaab
S->bA->bcS->bcbA->bcbaab
S->bA->bcS->bccA->bccaab
S->cA->caS->caaA->caaaab
S->cA->caab
S->cA->caS->cabA->cabaab
S->cA->caS->cacA->cacaab
S->cA->cbS->cbaA->cbaaab
S->cA->cbS->cbbA->cbbaab
S->cA->cbS->cbcA->cbcaab
S->cA->ccS->ccaA->ccaaab
S->cA->ccS->ccbA->ccbaab
S->cA->ccS->cccA->cccaab
