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fri - fritt, et fritt folk
*Hvit takes an extra -t, et hvitt hus.*
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Adjectives ending in -el, -en, -er dropp the -e and a double consonant is reduced to a single one.
en gammel mann - et gammelt hus - to gamle menn - to gamle hus - to gammle gamle hus
en skummel gate - et skummelt hus - to skumle menn (skummel - scary)
en vakker hund - et vakkert barn - to vakre barn