@Creideiki true, but it's still better to use paraphrases.
4-word, English, all lowercase paraphrase with single space word separators: 8.5 * 10^20 combinations of words. That is more than all the possible combinations of 10 printable ASCII characters (6.6 * 10^19), except easier to remember.
Factor in uppercase characters, punctuation (which dictionary attacks cannot find) and other languages and it's even better.
I don't believe this is correct.
If enough people use 3-4 word phrases, brute force attackers will specifically adapt to this.
Assuming a lexicon of 20,000 words (average native speaker) you get 20,000 ^ 4 permutations or 1.6e+17
Assuming 68 alpha numeric characters (lower, upper, digits, 10 symbols) you only need 10 characters to surpass this (68^10 or 2.1e+18)
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