These variations have arisen chiefly through cross-breeding, though not entirely so, there being a few cases upon record of the production of "sports" from tubers that have become the parents of new varieties, but authentic cases of the sporting of tubers are few and far between.
The technological imperatives we were subjected to were few and far between.
corroborative sightings may well be few and far between.
lascivious material is admittedly few and far between.
If, however, you actually plan to print out and enlarge photographs that you take with your camera phone, find one with at least 3 megapixels, although these models are few and far between at this point in time.