How can i cut a poly like ive marked below? thanks

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An idea is delicate.
It can be killed by a sneer or yawn,
It can be stabbed to death by a joke
Or worried to death by a frown
On the right persons brow.
-Charles Browers

Use the split poly tool and turn off edge-snapping.

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"Terminat Bora Diem, Terminal Auctor opus."

thanks could never figure that out

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An idea is delicate.
It can be killed by a sneer or yawn,
It can be stabbed to death by a joke
Or worried to death by a frown
On the right persons brow.
-Charles Browers