For example, Missouri can be solved with any of the following combinations: mo/mr/ms/om/or/os/rm/ro/rs/sm/so/sr/ss. Since the letters I and U are not allowed, the following combinations won't work: ii/im/io/ir/is/iu/mi/mu/oi/ou/ri/ru/si/su/ui/um/uo/ur/us.
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