some constraints of Oulipo (from wikipedia):
- S+7, sometimes called N+7
- Replace every noun in a text with the noun seven entries after it in a dictionary. For example, "Call me Ishmael. Some years ago..." (from Moby-Dick) becomes "Call me islander. Some yeggs ago...". Results will vary depending upon the dictionary used. This technique can also be performed on other lexical classes, such as verbs.
- Snowball
- A poem in which each line is a single word, and each successive word is one letter longer.
- Lipogram
- Writing that excludes one or more letters. The previous sentence is a lipogram in B, F, H, J, K, Q, V, Y, and Z (it does not contain any of those letters).
- Prisoner's constraint, also called "Macao" constraint
- A type of lipogram that omits letters with ascenders and descenders (b, d, f, g, h, j, k, l, p, q, t, and y).
- Palindromes
- Sonnets and other poems constructed using palindromic techniques.
