More constructively, Mieder has proposed the following definition, "A proverb is a short, generally known sentence of the folk which contains wisdom, truth, morals, and traditional views in a metaphorical, fixed, and memorizable form and which is handed down from generation to generation". Norrick created a table of distinctive features to distinguish proverbs from idioms, cliches, etc. Prahlad distinguishes proverbs from some other, closely related types of sayings, "True proverbs must further be distinguished from other types of proverbial speech, e.g. proverbial phrases, Wellerisms, maxims, quotations, and proverbial comparisons." Based on Persian proverbs, Zolfaghari and Ameri propose the following definition: "A proverb is a short sentence, which is well-known and at times rhythmic, including advice, sage themes and ethnic experiences, comprising simile, metaphor or irony which is well-known among people for its fluent wording, clarity of expression, simplicity, expansiveness and generality and is used either with or without change."