The definite article may be inserted between a preposition or a conjunction and the word it refers to, creating composite words like "mé-ha-kfar" (= "from the village"). The latter also demonstrates the change in the vowel of "mi-". With "be", "le" and "ke", the definite article is assimilated into the prefix, which then becomes "ba", "la" or "ka". Thus *"be-ha-matos" becomes "ba-matos" (= "in the plane"). Note that this does not happen to "mé" (the form of "min" or "mi-" used before the letter "he"), therefore "mé-ha-matos" is a valid form, which means "from the airplane".