Structure, Metrical Requirement, Rhyme Scheme Requirement, Other Requirement, Stanzaic

Pronounced “owdl gow-widd” Seven syllable quatrains with end rhyme and couplet binding. See the schematic.

Welsh

* * * * * * A
* * A * * * B (A could shift to 3rd or 4th syllable)
* * * * * * C
* * C * * * B (B could shift to 3rd or 4th syllable)

The mid-line rhymes can be various forms of
half-rhyme, such as consonance or assonance.
The main rhyme (B) should be perfect.

4

Reference Link

Incomplete