(a) when a dictionary is being edited, a lexicographer collects all the alphabetically arranged citation slips for a particular word
(b) the moment a new word is coined, it usually enters the spoken language.
(c) the dictionary takes note of it and makes a note of it on a citation slip.
(d) the word then passes from the realm of hearing to the realm of writing.

A

abcd

B

acbd

C

bacd

D

bcad