interesting tho. This single stamp?
850,000 at auction. 1918
Do you realize we have been flying for only
100 years?
This is a puzzle I made for
Mathpuzzle.
I have solved a number of the puzzles on that
site and communicated with Ed Pegg Jr. (the
site creator) over the years.
Puzzle: Given 16 squares
9 with single diagonal
3 with double diagonal
4 blank
Make one large square with 5 lines,
all lines border to border.
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