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Manholes…
Manhole covers are round…
Some look, notably telephone are square, and, can fall.The hole in the middle serves for being able to open them with a bar of metallic type made mainly by iron
(*) If you are friendless, this my be the right thing to start gather some!
are round… so that they cannot fall in the opening.
Some covers are square (like for phone booth) and could fall.
The hole in the middle is for opening them with a metallic bar mainly made of iron.