In the mneumonics below, I try to capture ideas in as assonantly dense a phrase as possible. Using the CMU pronouncing dictionary, I'm able to (approximately) score how densely I've packed vowel phonemes into the phrases. In particular, I define density as the ratio of achieved vowel phoneme overlaps to the total possible number of vowel phoneme overlaps. Under this definition, the phrase The quick brown fox jumps over the lazy dog has a density of 0.14, while the phrase La la la la la has a density of 1.0.
Density: 0.306
Density: 0.183
Density: 0.306
Density: 0.227
Density: 0.313
Density: 0.164
Density: 0.195
Density: 0.220
Density: 0.156
Density: 0.207
Density: 0.172
Density: 0.254