卵を一ダースづつつめなさい。

eggs; egg; spawn; roe; hen egg; (an expert) in the making; beginning; origin; infancy

indicates direct object of action; indicates subject of causative expression; indicates an area traversed; indicates time (period) over which action takes place; indicates point of departure or separation of action; indicates object of desire, like, hate, etc.

one; best; first; foremost; beginning; start; bottom string (on a shamisen, etc.)

dozen