Step 1: Examine each usage.
(a) "Eye for detail" - correct idiomatic usage.
(b) “Waiting for the day” - correct prepositional usage.
(c) "Bear for her to be angry" - acceptable usage in English.
(d) "For ever" is awkward; the standard expression is "forever" (one word). Hence this is inappropriate. \[ \Rightarrow \boxed{(d)} \]
Find the missing code:
L1#1O2~2, J2#2Q3~3, _______, F4#4U5~5, D5#5W6~6