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by nature: P. and V. φύσει.
according to nature: P. κατὰ φύσιν.
without external interference: P. ἀπὸ ταυτομάτου.
as is to be expected: P. and V. εἰκότως, ὡς εἰκός.
unaffectedly: P. and V. ἁπλῶς.
by one's own powers: P. and V. οἴκοθεν.
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