Fuzzy Set Implementation

Sample input: (10, 0.7) ; (20, 0.2) ; (30, 0.4) ; (40, 0.1) ; (50, 0) ; (60, 0.5)
Sample input: (10, 0.3) ; (20, 0.4) ; (30, 0.6) ; (40, 0) ; (50, 0.5) ; (60, 1)
Sample input: 0.5