Today is our wedding anniversary.

This is the souvenir I brought back from my trip.

In set theory, the symmetric difference indicates the difference between two sets.

My reaction to his opinion was calm.

He learned a new way to cope with stress.

He knows how to deal with that problem.

He remembered something funny and let out a guffaw.

He guffawed after hearing a funny joke.

This flower shows perfect bilateral symmetry.

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