The islanders of Fictitia have a rather eccentric postal system. Postage for an item can be anything from 1 dinar to 12 dinari, and you must use exact postage.
Frustratingly, there is only space on the envelopes in Fictitia to attach a maximum of two stamps.
What is more, they only have four different denominations of stamps, can you work out what they are?
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