Discussion
Why do conditional effects complicate regression search?
Answer: D
Working backwards must consider both the case where the condition held and the case where it did not, which branches the search. Forward search simply evaluates the condition. Reversibility, action counts and unconditional requirements are different issues. A feature that is cheap in one search direction and expensive in the other is worth noting when choosing between them, since the choice is otherwise made on other grounds entirely. Checking the units of each quantity catches a wrong formula before the arithmetic begins.
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