0 a sentence that contains every letter of the alphabet, if possible with each letter only being used once:
The most challenging pangrams are the ones with the fewest letters.
Everybody knows one or two pangrams.
In his chapter on wordplay he discusses palindromes and pangrams.
A perfect heterogram is, however, the same as a perfect pangram, since both consist of all letters of the alphabet with each represented exactly once.
The ("e") above would have been pronounced "ye", making the pangram incomplete.
A heterogram may be distinguished from a pangram (a holoalphabetic sentence), which uses all of the letters of the alphabet (possibly more than once).
In a sense, the pangram is the opposite of the lipogram, in which the aim is to omit one or more letters.
