This commit rewrites the Coq solutions for ladidah and toodeloo so they now use the opposite proof styles: ladidah is proved by destructing the disjunction early and replaying the implication chain in each branch, while toodeloo is proved by splitting early and rebuilding the same derivation for each conjunct. The surrounding commentary and shown proof terms were updated to match, with the notes now emphasizing how early destruct/split affects duplication and proof size. Practically, this makes exercise 13 a clearer comparison of forward vs. backward proof structure and their linear proof-term complexity.