Structure, Metrical Requirement, Rhyme Scheme Requirement, Stanzaic

A syllabic sestet where all lines except the fifth are nine syllables and monorhymed. The fifth line is ten syllables and has a separate rhyme that is cross-rhymed with the sixth line (seventh through the tenth syllable of fifth line cross-rhymes with fourth through the sixth in sixth line).

Welsh

xxxxxxxxa
xxxxxxxxa
xxxxxxxxa
xxxxxxxxa
xxxxxxbxxx (a syllable between 7 and 10)
xxxbxxxxa (a syllable between 4 and 6)

6

Incomplete

Byr A Thoddaid, Gwawdodyn Hir, Sestet