All four of these are examples of a Tetrameter.
What is a Tetrameter?
In a poetry, all the four beats placed in the same line, it is called tetrameter.
It consists of four metrical feet and in English, the feet are usually iambs.
Iambs means an unstressed syllable followed by a stressed one.
A meter plays a crucial role in a poem as the readers can understand the rhythms and lines in a poem.
So the answer is tetrameter.
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