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double p= .0000000000000001921;
It is: q+p because a double minus becomes a plus
P = 2*T where P = # toothpicks and T = # tiles.
The Jefferson series of U.S. nickels known to have doubled die errors are: 1939-P/ 1943-P/ 1945-P.
P=2L+2W Add double the length to double the width 30+17=47