Find the number of solutions to the equation
1/a+1/b+1/c+1/d=1
where a, b, c, d are positive integers and a≤ b≤ c≤ d.
1/a+1/b+1/c+1/d=1
where a, b, c, d are positive integers and a≤ b≤ c≤ d.
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