The same two marks (5)

I believe the answer is:

ditto

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'the same' is the definition.
(ditto means the same as previously mentioned)

I don't understand how the rest of the clue works.

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(Other definitions for ditto that I've seen before include "Dot it for the same again" , "Repeat (instruction)" , "As per previous" , "Two dots say same again" , "couple of marks" .)

I've seen this clue in The Mirror.

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