The AWDL GYWYDD (OW-dull GOW-with) is an old Welsh poetry form that combines simple syllable counts, with internally linked rhymes. Each verse is built of four 7-syllable lines, with a rhyme scheme of a, (a)b, c, (c)b. The internal rhyme can occur on syllable 3 or 4. - Here is a sample: https://theprose.com/post/182706/sweet-recollections (Please tag me in the comments of your entry)