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Yes, there is. For example, a box-letter arrow is a polygon. A stick-letter arrow is not, because it is not in 1 piece
box
George E. Becket created the letter box
it should be on the board or the box of the board of 15 digits of letters and numbers:
1 letter + 5 numbers + 1 letter + 8 numbers.
what is the uses of green letter box?
I want to know due to my knowledge.