By and Of

By adverb - At, within, or to a short distance or time.

Of and by are semantically related in toward topic. In some cases you can use "Of" instead a preposition "By", when it comes to topics like on, to, per, for.

Of preposition - Earlier than.

By and of are semantically related in toward topic. Sometimes you can use "By" instead a preposition "Of", if it concerns topics such as on, to, per, for.