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has been tried tried is being tried has tried
has tried; stop have tried; keep has been tried; prevent have been tried; prevent
use result conclusion difference
has tried has been tried was tried were tried
lose heart; has been lose heart; had been lose his heart; was lose his heart; had
has made…have tried made…have tried has made…tried made…tried
lose heart; has been lose heart; had been lose his heart; was lose his heart; had
have tried have been tried has tried has been tried
have tried; a success have been tried; successful has tried; to be successful has been tried; successful
try tried to be tried to try
has tried has been tried is being tried tried
has tried has been tried was tried were tried
lose heart; has been lose heart; have been lose his heart; was lose his heart; had
have been tried; by this means has been tried; in this way has been tried; in this means are tried; by this means
A.have tried have been tried has tried has been tried
has tried; stop have tried; keep has been tried; prevent have been tried; stop
has tried; has proved tried; proves has been tried; proves is being tried; is proved
has tried have tried has been tried have been tried
have been tried has been tried have tried has tried
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