add back replacement rules for AoPS post_canonical LaTeX.
add back replacement rules for AoPS post_canonical LaTeX.

approach0/search-engine,t-k-/the-day-after-tomorrow,t-k-/the-day-after-tomorrow,approach0/search-engine,t-k-/the-day-after-tomorrow,approach0/search-engine,t-k-/the-day-after-tomorrow,approach0/search-engine,t-k-/the-day-after-tomorrow,t-k-/the-day-after-tomorrow,t-k-/the-day-after-tomorrow