Her necklace was in the beautiful shape of a butterfly.

This sentence is using the inclusive form.

This grammar rule is using the exclusive form.

Exclusive form of grammar is used to refer to a specific object only.

He is a perfectionist, so he is very strict about his work.

He played a perfect fifth scale on the piano.

My father works at a paper mill.

My father has been working as a silk manufacturer for many years.

I attend psychotherapy sessions every week.

My father works at a paper mill.