Here, both " over " and "on" are prepositions. ", while, "on " is used to indicate:- attached to. For the first sentence, "over " denotes in reference to, while for the second, the preposition "on" implies "about".
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tfou"over" and "on" the issueYou are relating over and on to the words that follow. Instead, they are chosen on the basis of the words that precede.