Novial
If a noun refers to a living being, then the form ending in -e is neutral in regards to sex, the one ending in -a female, and the one ending in -o male. If the noun is based on an adjective, nouns referring to living beings can be made with the previously mentioned rule, and furthermore nouns referring to concrete objects with -u, and abstractions with -um. The third person pronouns follows the same rule, together with the definite article.