The term 'A DELE UNDO' is a combination of six words, each with a different number of letters. The first word is 'STET' (4 letters), which is a Latin term meaning 'let it stand'. The second word is 'EDIT' (4 letters), which means to make changes or corrections to a text. The third word is 'STETS' (5 letters), which is the plural form of 'STET'. The fourth word is 'ERASE' (5 letters), which means to remove something completely. The fifth word is 'ANNUL' (5 letters), which means to cancel or invalidate something. The sixth and final word is 'REPEAL' (6 letters), which means to revoke or rescind a law or decision. Together, these words can be interpreted as a call to undo any changes that have been made, either by reverting back to the original text or by cancelling the changes altogether.