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A. a = {key1,value1,key2,value2}
B. b = [key1:value1,key2:value2]
C. c = {key1,value1:key2,value2}
D. d = {key1:value1,key2:value2}

A. a = {[1,2] : 1 , [3,4] : 3}
B. b = {1 : as , b : sf}
C. c = {(1,2) : 1 , (3,4) : 3}
D. a = {key : 1 , 3 : [1,3] }