1.

Matching list type:

Answer»

<P>`{:(P,Q,R,S),(3,4,1,2):}`
`{:(P,Q,R,S),(2,4,1,3):}`
`{:(P,Q,R,S),(4,3,1,2):}`
`{:(P,Q,R,S),(2,3,1,4):}`

ANSWER :A


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