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was proved has ben turned out turned proved
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By; has proved With; has proved Under; is proving With; is proved
is proved proving was proved has proved
a teacher has given; are the students has a teacher given; are the students. has a teacher given; the students are a teacher has given; the students are
became has turned came proved
was proved has been proved proved is proved
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is proved proving was proved has proved
was proved proved has been proved proved as
is proved proves has proved proved
proving proved was proved has been proved
proved was proved proves has been proved
has tried; has proved tried; proves has been tried; proves is being tried; is proved
deserves expects reserves demands