The full corpus behind every sound-correspondence table in the book — every cognate pair, where the printed pages show only a handful each. Pick an edition: the same method applied to two dialect pairings.
Castilian Spanish and European Portuguese — the pairing of the printed edition, with the theta, the dark l, and the uvular r.
Mexican Spanish and Brazilian Portuguese — seseo (no theta), yeísmo, and a coda l vocalized to a glide.