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DominicR
The answer is "on their back." Because you are using a plural pronoun you also need to use a plural noun to agree with it. The people aren't sharing one back.
♥ "Back" Is referring to one person, and since they do not share a back, then it is not going to be "back"
♥ Now since in this case we are referring to more then one person, i can tell by "their"
♥ then were going to have "backs"
♥ Therefore your answer is "Backs"

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