Heterogram¶
heterogram · letter · validated
A text in which no letter is repeated.
Provenance¶
- Source: Dmitri A. Borgmann, Language on Vacation (1965)
- Attribution:
reference— attested in a standard reference rather than traced to an origin - Checkability:
self— decidable from the text and its parameters alone - Attested:
codified— formulated as a rule by a tradition rather than declared by an author
Details¶
- Kind: restrictive
- Languages: en, de
- Requires:
tokens,fold_diacritics - Deterministic: yes
- Also known as: isogram
- In other languages: Heterogramm (de), Hétérogramme (fr)
Prompt hint¶
Write a phrase in which no letter of the alphabet appears more than once.
Parameters¶
| Name | Type | Default | Description |
|---|---|---|---|
fold_diacritics |
boolean | True |
Treat accented letters as their base letter, and ß as ss. |
scope |
string | text |
Where repeats are banned. |
Examples¶
perfect-heterogram¶
en — this text satisfies the procedure.
Mr Jock, TV quiz PhD, bags few lynx
Source: Traditional perfect pangram, also a heterogram
ordinary-prose¶
en — this text does not satisfy the procedure.
letters repeat here
Source: constructed counterexample
ohne-wiederholung¶
de — this text satisfies the procedure.
Boxkampf würdig
Source: constructed example
mit-wiederholung¶
de — this text does not satisfy the procedure.
Die Blumen blühen wieder
Source: constructed counterexample