Find the column names that break the rules for the first line of a tabular file (specification 3.2.10).
The column names, exactly as written.
Each name that begins or ends with whitespace once, in header order; the 1-based positions of the blank names; and each other name that appears more than once (see findDuplicateHeaders).
Find the column names that break the rules for the first line of a tabular file (specification 3.2.10).