once upon a time,there were a flock of birds lived happily in the forest.one day,a hunter went to the forest to shoot birds.when he found the birds,he felt very happy.he counted them and got that there were twenty-five birds on one tree.oh!what a big number!he would have a good dinner if he could shoot all of them.then he took his gun and aimed at the birds carefully.boom!one bird got shot.then,can you guess how many birds left on the tree?
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