Query

What’s remarkable about this set of words?

BIOLOGY
DEATHLY
SLOSHED
BASTARD
SELVAGE
FISSILE
DALLIES
FLAVORS

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Any two words in the set have exactly one “crash” — one letter that’s in the same position in each word. (A. Ross Eckler, “Every Word-Pair in This Set Has One Crash,” Word Ways 32:1 [February 1999], 3-7.)