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# ab:aab=a,bbbbb=bb a/b aaaa=a ab=aaa bbbbb=bb
| 1 | a | b | a2 | ba | b2 | a3 | ba2 | b2a | b3 | ba3 | b2a2 | b3a | b4 | b2a3 | b3a2 | b4a | b3a3 | b4a2 | b4a3 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 1 | a | b | a2 | ba | b2 | a3 | ba2 | b2a | b3 | ba3 | b2a2 | b3a | b4 | b2a3 | b3a2 | b4a | b3a3 | b4a2 | b4a3 |
| a | a | a2 | a3 | a3 | a | a2 | a | a2 | a3 | a | a3 | a | a2 | a3 | a2 | a3 | a | a | a2 | a3 |
| b | b | ba | b2 | ba2 | b2a | b3 | ba3 | b2a2 | b3a | b4 | b2a3 | b3a2 | b4a | b2 | b3a3 | b4a2 | b2a | b4a3 | b2a2 | b2a3 |
| a2 | a2 | a3 | a | a | a2 | a3 | a2 | a3 | a | a2 | a | a2 | a3 | a | a3 | a | a2 | a2 | a3 | a |
| ba | ba | ba2 | ba3 | ba3 | ba | ba2 | ba | ba2 | ba3 | ba | ba3 | ba | ba2 | ba3 | ba2 | ba3 | ba | ba | ba2 | ba3 |
| b2 | b2 | b2a | b3 | b2a2 | b3a | b4 | b2a3 | b3a2 | b4a | b2 | b3a3 | b4a2 | b2a | b3 | b4a3 | b2a2 | b3a | b2a3 | b3a2 | b3a3 |
| a3 | a3 | a | a2 | a2 | a3 | a | a3 | a | a2 | a3 | a2 | a3 | a | a2 | a | a2 | a3 | a3 | a | a2 |
| ba2 | ba2 | ba3 | ba | ba | ba2 | ba3 | ba2 | ba3 | ba | ba2 | ba | ba2 | ba3 | ba | ba3 | ba | ba2 | ba2 | ba3 | ba |
| b2a | b2a | b2a2 | b2a3 | b2a3 | b2a | b2a2 | b2a | b2a2 | b2a3 | b2a | b2a3 | b2a | b2a2 | b2a3 | b2a2 | b2a3 | b2a | b2a | b2a2 | b2a3 |
| b3 | b3 | b3a | b4 | b3a2 | b4a | b2 | b3a3 | b4a2 | b2a | b3 | b4a3 | b2a2 | b3a | b4 | b2a3 | b3a2 | b4a | b3a3 | b4a2 | b4a3 |
| ba3 | ba3 | ba | ba2 | ba2 | ba3 | ba | ba3 | ba | ba2 | ba3 | ba2 | ba3 | ba | ba2 | ba | ba2 | ba3 | ba3 | ba | ba2 |
| b2a2 | b2a2 | b2a3 | b2a | b2a | b2a2 | b2a3 | b2a2 | b2a3 | b2a | b2a2 | b2a | b2a2 | b2a3 | b2a | b2a3 | b2a | b2a2 | b2a2 | b2a3 | b2a |
| b3a | b3a | b3a2 | b3a3 | b3a3 | b3a | b3a2 | b3a | b3a2 | b3a3 | b3a | b3a3 | b3a | b3a2 | b3a3 | b3a2 | b3a3 | b3a | b3a | b3a2 | b3a3 |
| b4 | b4 | b4a | b2 | b4a2 | b2a | b3 | b4a3 | b2a2 | b3a | b4 | b2a3 | b3a2 | b4a | b2 | b3a3 | b4a2 | b2a | b4a3 | b2a2 | b2a3 |
| b2a3 | b2a3 | b2a | b2a2 | b2a2 | b2a3 | b2a | b2a3 | b2a | b2a2 | b2a3 | b2a2 | b2a3 | b2a | b2a2 | b2a | b2a2 | b2a3 | b2a3 | b2a | b2a2 |
| b3a2 | b3a2 | b3a3 | b3a | b3a | b3a2 | b3a3 | b3a2 | b3a3 | b3a | b3a2 | b3a | b3a2 | b3a3 | b3a | b3a3 | b3a | b3a2 | b3a2 | b3a3 | b3a |
| b4a | b4a | b4a2 | b4a3 | b4a3 | b4a | b4a2 | b4a | b4a2 | b4a3 | b4a | b4a3 | b4a | b4a2 | b4a3 | b4a2 | b4a3 | b4a | b4a | b4a2 | b4a3 |
| b3a3 | b3a3 | b3a | b3a2 | b3a2 | b3a3 | b3a | b3a3 | b3a | b3a2 | b3a3 | b3a2 | b3a3 | b3a | b3a2 | b3a | b3a2 | b3a3 | b3a3 | b3a | b3a2 |
| b4a2 | b4a2 | b4a3 | b4a | b4a | b4a2 | b4a3 | b4a2 | b4a3 | b4a | b4a2 | b4a | b4a2 | b4a3 | b4a | b4a3 | b4a | b4a2 | b4a2 | b4a3 | b4a |
| b4a3 | b4a3 | b4a | b4a2 | b4a2 | b4a3 | b4a | b4a3 | b4a | b4a2 | b4a3 | b4a2 | b4a3 | b4a | b4a2 | b4a | b4a2 | b4a3 | b4a3 | b4a | b4a2 |
| Σ | # | Presentation | Description | Related |
|---|---|---|---|---|
| 8 | 526 | ⟨a, b | aab=a, bbbb=1⟩ | Finite non-commutative monoid with 20 elements | 10 iso, 9 anti-iso |
| 9 | 2207 | ⟨a, b | ab=aa, bbbb=b⟩ | Finite non-commutative monoid with 20 elements | 1 anti-iso |
| 10 | 4095 | ⟨a, b | baa=abb, abab=1⟩ | Finite non-Abelian group with 20 elements | 4 iso, 1 anti-iso |
| 10 | 4212 | ⟨a, b | aaaaa=1, abbbb=1⟩ | Isomorphic to ℤ20 | 16 iso |
| 10 | 5349 | ⟨a, b | aaa=bb, bab=aa⟩ | Finite non-commutative monoid with 20 elements | 1 iso |
| 10 | 6728 | ⟨a, b | aba=a, aaaa=bb⟩ | Finite non-commutative monoid with 20 elements | |
| 10 | 6764 | ⟨a, b | aba=b, aaaa=bb⟩ | Finite non-commutative monoid with 20 elements | |
| 10 | 7117 | ⟨a, b | ab=aa, bbbb=bb⟩ | Finite non-commutative monoid with 20 elements | |
| 11 | 12159 | ⟨a, b | aaaa=aa, abbb=b⟩ | Finite non-commutative monoid with 20 elements | |
| 11 | 12322 | ⟨a, b | aaab=bb, bbba=a⟩ | Finite non-commutative monoid with 20 elements | |
| 11 | 14367 | ⟨a, b | aaaa=a, bbbbb=a⟩ | Isomorphic to ℕ(20 = 5) | |
| 11 | 14407 | ⟨a, b | aaaa=b, bbbbb=a⟩ | Isomorphic to ℕ(20 = 1) | |
| 11 | 14408 | ⟨a, b | aaaa=b, bbbbb=b⟩ | Isomorphic to ℕ(20 = 4) | |
| 11 | 15933 | ⟨a, b | aba=bb, baaab=a⟩ | Finite non-commutative monoid with 20 elements | |
| 11 | 16124 | ⟨a, b | aab=aa, baba=bb⟩ | Finite non-commutative monoid with 20 elements | |
| 11 | 16339 | ⟨a, b | aba=aa, aaaa=bb⟩ | Finite non-commutative monoid with 20 elements | |
| 11 | 16343 | ⟨a, b | aba=aa, aaab=bb⟩ | Finite non-commutative monoid with 20 elements | |
| 11 | 16545 | ⟨a, b | aba=bb, abb=aaa⟩ | Finite non-commutative monoid with 20 elements | |
| 11 | 18619 | ⟨a, b | aba=b, aaaaabb=1⟩ | Finite non-Abelian group with 20 elements | 3 iso |
| 11 | 21047 | ⟨a, b | ab=aa, bbbb=bbb⟩ | Finite non-commutative monoid with 20 elements |