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# ab:aaa=aa,bbb=ab b/a bbbbbbb=bbbbb ab=bbb aaa=aa
| 1 | a | b | a2 | ba | b2 | ba2 | b2a | b3 | b2a2 | b3a | b4 | b3a2 | b4a | b5 | b4a2 | b5a | b6 | b5a2 | b6a | b6a2 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 1 | a | b | a2 | ba | b2 | ba2 | b2a | b3 | b2a2 | b3a | b4 | b3a2 | b4a | b5 | b4a2 | b5a | b6 | b5a2 | b6a | b6a2 |
| a | a | a2 | b3 | a2 | b3a | b4 | b3a2 | b4a | b5 | b4a2 | b5a | b6 | b5a2 | b6a | b5 | b6a2 | b5a | b6 | b5a2 | b6a | b6a2 |
| b | b | ba | b2 | ba2 | b2a | b3 | b2a2 | b3a | b4 | b3a2 | b4a | b5 | b4a2 | b5a | b6 | b5a2 | b6a | b5 | b6a2 | b5a | b5a2 |
| a2 | a2 | a2 | b5 | a2 | b5a | b6 | b5a2 | b6a | b5 | b6a2 | b5a | b6 | b5a2 | b6a | b5 | b6a2 | b5a | b6 | b5a2 | b6a | b6a2 |
| ba | ba | ba2 | b4 | ba2 | b4a | b5 | b4a2 | b5a | b6 | b5a2 | b6a | b5 | b6a2 | b5a | b6 | b5a2 | b6a | b5 | b6a2 | b5a | b5a2 |
| b2 | b2 | b2a | b3 | b2a2 | b3a | b4 | b3a2 | b4a | b5 | b4a2 | b5a | b6 | b5a2 | b6a | b5 | b6a2 | b5a | b6 | b5a2 | b6a | b6a2 |
| ba2 | ba2 | ba2 | b6 | ba2 | b6a | b5 | b6a2 | b5a | b6 | b5a2 | b6a | b5 | b6a2 | b5a | b6 | b5a2 | b6a | b5 | b6a2 | b5a | b5a2 |
| b2a | b2a | b2a2 | b5 | b2a2 | b5a | b6 | b5a2 | b6a | b5 | b6a2 | b5a | b6 | b5a2 | b6a | b5 | b6a2 | b5a | b6 | b5a2 | b6a | b6a2 |
| b3 | b3 | b3a | b4 | b3a2 | b4a | b5 | b4a2 | b5a | b6 | b5a2 | b6a | b5 | b6a2 | b5a | b6 | b5a2 | b6a | b5 | b6a2 | b5a | b5a2 |
| b2a2 | b2a2 | b2a2 | b5 | b2a2 | b5a | b6 | b5a2 | b6a | b5 | b6a2 | b5a | b6 | b5a2 | b6a | b5 | b6a2 | b5a | b6 | b5a2 | b6a | b6a2 |
| b3a | b3a | b3a2 | b6 | b3a2 | b6a | b5 | b6a2 | b5a | b6 | b5a2 | b6a | b5 | b6a2 | b5a | b6 | b5a2 | b6a | b5 | b6a2 | b5a | b5a2 |
| b4 | b4 | b4a | b5 | b4a2 | b5a | b6 | b5a2 | b6a | b5 | b6a2 | b5a | b6 | b5a2 | b6a | b5 | b6a2 | b5a | b6 | b5a2 | b6a | b6a2 |
| b3a2 | b3a2 | b3a2 | b6 | b3a2 | b6a | b5 | b6a2 | b5a | b6 | b5a2 | b6a | b5 | b6a2 | b5a | b6 | b5a2 | b6a | b5 | b6a2 | b5a | b5a2 |
| b4a | b4a | b4a2 | b5 | b4a2 | b5a | b6 | b5a2 | b6a | b5 | b6a2 | b5a | b6 | b5a2 | b6a | b5 | b6a2 | b5a | b6 | b5a2 | b6a | b6a2 |
| b5 | b5 | b5a | b6 | b5a2 | b6a | b5 | b6a2 | b5a | b6 | b5a2 | b6a | b5 | b6a2 | b5a | b6 | b5a2 | b6a | b5 | b6a2 | b5a | b5a2 |
| b4a2 | b4a2 | b4a2 | b5 | b4a2 | b5a | b6 | b5a2 | b6a | b5 | b6a2 | b5a | b6 | b5a2 | b6a | b5 | b6a2 | b5a | b6 | b5a2 | b6a | b6a2 |
| b5a | b5a | b5a2 | b6 | b5a2 | b6a | b5 | b6a2 | b5a | b6 | b5a2 | b6a | b5 | b6a2 | b5a | b6 | b5a2 | b6a | b5 | b6a2 | b5a | b5a2 |
| b6 | b6 | b6a | b5 | b6a2 | b5a | b6 | b5a2 | b6a | b5 | b6a2 | b5a | b6 | b5a2 | b6a | b5 | b6a2 | b5a | b6 | b5a2 | b6a | b6a2 |
| b5a2 | b5a2 | b5a2 | b6 | b5a2 | b6a | b5 | b6a2 | b5a | b6 | b5a2 | b6a | b5 | b6a2 | b5a | b6 | b5a2 | b6a | b5 | b6a2 | b5a | b5a2 |
| b6a | b6a | b6a2 | b5 | b6a2 | b5a | b6 | b5a2 | b6a | b5 | b6a2 | b5a | b6 | b5a2 | b6a | b5 | b6a2 | b5a | b6 | b5a2 | b6a | b6a2 |
| b6a2 | b6a2 | b6a2 | b5 | b6a2 | b5a | b6 | b5a2 | b6a | b5 | b6a2 | b5a | b6 | b5a2 | b6a | b5 | b6a2 | b5a | b6 | b5a2 | b6a | b6a2 |
| Σ | # | Presentation | Description | Related |
|---|---|---|---|---|
| 8 | 402 | ⟨a, b | aaa=ab, bbb=1⟩ | Finite non-commutative monoid with 21 elements | 12 iso, 27 anti-iso |
| 9 | 1599 | ⟨a, b | aaa=ab, bbb=b⟩ | Finite non-commutative monoid with 21 elements | 1 anti-iso |
| 10 | 6265 | ⟨a, b | aaa=a, abbbb=b⟩ | Finite non-commutative monoid with 21 elements | 2 iso |
| 11 | 11127 | ⟨a, b | aaaaa=b, abbbb=1⟩ | Isomorphic to ℤ21 | 13 iso |
| 11 | 13091 | ⟨a, b | bab=aaa, abba=b⟩ | Finite non-commutative monoid with 21 elements | |
| 11 | 13248 | ⟨a, b | bab=aaa, bbb=aa⟩ | Finite non-commutative monoid with 21 elements | |
| 11 | 15158 | ⟨a, b | aab=ba, ababab=1⟩ | Finite non-Abelian group with 21 elements | 1 iso |
| 11 | 19212 | ⟨a, b | aba=b, baaaab=a⟩ | Finite non-commutative monoid with 21 elements |