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It's not a sonnet, which has fourteen lines, the last two of which must be a couplet.
It's not an epic, which is a lengthy narrative poem.
It doesn't appear to be a haiku, which is usually three lines of five-seven-five syllables.
I'm not sure what a beat poem is, though, so through process of elimination, I'd say it's that. Could be wrong, though.
Now the thing with poetry is that sometimes two forms will overlap, sort of like the whole example that says: all squares are rectangles, but not all rectangles are squares.
A line of poetry that has 12 syllables. The name probably comes from a medieval romance about Alexander the Great that was written in 12-syllable lines.
That's what I figured but I agree with ingenue. It's probably a beat poem. Now it could possibly be a haiku because in the Japanese language they oftentimes jam thje syllables together and the first line is twelve syllables. So yeah... hope that narrows it down :p