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Presumably you're asking about a route "Any Permitted" Anytime Return, or Off Peak Return, from Manchester Stns to/from Peterborough, rather than (say) a couple of Advance Singles?
There are many permitted routes, but MN + AL & AM (https://rgpp.iblocks.co.uk/maps) are two of them, the former being via Leeds and the latter Nottingham & Hope Valley.
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