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a) N suma C to C
b) C iloczyn W to C
c) N iloczyn C to N
d)C-W to zbiór pusty
e)R suma NW to R
f)C iloczyn NW to zbiór pusty
a) N suma C to n
b) C iloczyn W to w
c) N iloczyn C to c
d)C-W to zbiór pusty
e)R suma NW to nw
f)C iloczyn NW to c