The scheme is : aba aba aba aba aba abaa
A tercet poem does not have to have a specific rhyme scheme. It can go ABA, AAB, AAA, ABB, etc. It can even be completely unrhyming- for example, a haiku.
A rhyme scheme can be anything you like.
Aba bcc
Any poem u want to make!
aba
Three-line stnazas with the rhyme scheme aba, bcb
A turset is the first 3 lines of a sonnet, usually consisting of a rhyme scheme in the order of ABA.
A Triplet, as in: Do not go gentle into that good night. Old age should burn and rave at close of day, Rage, Rage against the dying of the light. The poem is made up of 5 triplets (such as this, the first one in rhyme scheme aba) and a quatrain at the end (four-line stanza, rhyme scheme abab).
A tercet is a 3 lined poem with a rhyme scheme of (Aba-Ccc) example i once died and came to life and then i bought a pie when i bought the pie and i layed down to die i didnt die so i went to go and sigh
terza rima
a form of poetry that has three-line stanzas with the rhyme scheme aba, bcb