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Use "now and again" in a sentence
"Around nearby campfires was slow conversation and now and again a laugh, but the mournful whip-po'-wills in the thickets almost drowned the voices."
"We advanced slowly, botanizing as we went, now and again folding a specimen plant between the collecting boards while Latz wrote notes and assigned it a number."
"Herds of cattle or horses grazed the dry, brown grasses of the open steppe, with now and again a huge flock of fat-tailed sheep and a solitary shepherd on horseback."