Through chance:
— To sleep, perchance to dream....

synonym: by chance.

Roget 156: by chance, accidentally, by accident; casually; perchance etc. (possibly) 470; for aught one knows; as good would have it, as bad would have it, as luck would have it, as ill-luck would have it, as chance would have it; as it may be, as it may chance, as it may turn up, as it may happen; as the case may be.    ... show more

By chance.

synonyms: maybe, mayhap, peradventure, perhaps, possibly.

Roget 470: possibly, by possibility; perhaps, perchance, peradventure; maybe, may be, haply, mayhap.    if possible, wind and weather permitting, God willing, Deo volente [Lat.], D.   V.; as luck may have it.    ... show more