Other potentially offensive combinations, however, were allowed, such as codice_20 (resembling "caca", meaning "shit") and codice_21 (resembling "pene", meaning "penis"). Also allowed were combinations with potential political connotations, such as codice_22 (cf. Herri Batasuna) and codice_23 (cf. Partido Popular). Finally, some otherwise "forbidden" combinations (particularly those containing R or ending in one of the skipped vowels) were exceptionally used in a few particular cases, such as on some special types of cars (e.g. codice_24, codice_25... for some police cars, and codice_26 for Spanish Air Force land vehicles).