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very often in a time once upon a time once in a while
once and for all once upon a time once in a while all at once
a formula for determining the relationship between the depth and width of craters a valley that is filled in when a spatial body has impact with the moon or the earth a planetoid(small planet)created when a meteorite, upon striking the moon, breaks off a Part of the moon a dark spot on the moon, once supposed to be a sea, now a plain
the first time for the first time from time to time once upon a time
for long once in a while for good once upon a time
Once arrived As soon as he reached When he got Upon arriving
a river lay did a river lie a river did lie lay a river
a ;that a ;when the ;that the ;that
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