using the o and u sa Bisaya

i am writing for a visayan newspaper and the usage of letter o and u confuses me. e.g. the word polis or pulis, kapolisan or kapulisan, which is the right spelling for it? anybody pls enlighten me on this:D

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using the o and u sa Bisaya by wanderer (not verified)
kalatsutsi by kalatsutsi
^_^ by cuerps (not verified)
O and U by litogo