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This bug is fixed in sage 5.10 (trac ticket 14578), and you will now get the following answer :

{0: 0, 1: Z^25, 2: 0}

But a previous answer of @vdelecroix suggests that the answer could be:

{0: 0, 1: Z^18, 2: 0}

Perhaps there is a problem somewhere, what should be the right result ?