In forming triad systems in 15 letters, there are only four typical openings, viz: which, from the way in which the triads containing 1 are laced with those containing 2, may be called the single tetrad, triple tetrad, hexad, and duodecad types, ...

Suppose x belongs to ℝ... (— written: x∈ℝ)

Impatient, perhaps, for the child to be born, over the next weeks I was more “broodsome” than ever, as Randall put it — some word he'd picked up in the village.

Polaroids are used as window screens to regulate the amount of light entering the room.