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def function(a, b, c=0, d=0): return a + b - c + d print(function(10, 3)) print(function(10, 3, 7)) # 13 - 7 print(function(10, 3, 7, 1)) # 13 - 7 + 1 print(function(10, 3, d=100)) # 13 + 100 ''' run: 13 6 7 113 '''