Work is scoped against what the sources can actually support. Categories are checked against the underlying description, not the label attached upstream. Whatever was taken out ships beside whatever was left in.
File assembly
Records drawn together against those criteria, deduplicated, and checked for completeness.
Whitespace discipline
Removing the invisible differences that make two identical values compare as different.
Catch-all detection
Separating addresses that are confirmed from addresses on a domain that accepts anything.
A short conversation about definitions saves a long one about results.