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Often concerning love or work, and usually comical, Dodoitsu poems consist of four lines with the syllabic structure 7-7-7-5 and no rhyme or metre.

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"lục bát" = "six eight" is a Vietnamese verse form. Alternating lines of six and eight syllables. It will always begin with a six-syllable line and end with an eight-syllable one.
The form has a rather complicated and yet simple rhyme scheme, in which the sixth syllable of the eight syllable line rhymes with the sixth syllable of the previous line, which in turn rhymes with the eighth syllable of the line preceding it. There is no limit to the number of lines, but the eighth syllable of the last line rhymes with the first line.
An example of the lục bát rhyme scheme ("-" is an unrhymed syllable):
-----A
-----A-B
-----B
-----B-C
-----C
-----C-D
-----D
-----D-E
-----E
-----E-A