Four groups found in this puzzle - Answers with 12 Letters

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Similar Crossword Questions:

Market found in seven of this puzzle's other entries
They're found at the end of this puzzle's longest answers
Historic symbol whose shape can be found hidden in this completed puzzle
Sports area where this puzzle's theme is found
Regular stuff found inside this puzzle's three longest answers
Workweek start, or an apt title for this puzzle based on an abbreviation found in its five longest answers
Commercial interruptions literally found in this puzzle's three other longest answers
Waning ... or a hint to what is found by circling all the T's in the completed puzzle
A synonym for it can be found inside this puzzle's four longest entries
Perjure oneself ... or what can be found six times in this puzzle
Piece of work found in this puzzle's longer entries
Boat lifters found in this puzzle's three longest answers
Battery found, in a way, in eight puzzle answers
They are found in this puzzle's three longest answers
Puzzle honoree found in eight long answers
Advice for the brokenhearted ... or one of four arrangements found literally in this puzzle
Commerce minder found in eight of this puzzle's longest answers
Cryptographers' successes (and what can be found in the circles in this puzzle's long answers)
Corp. transfer found in this puzzle's four longest answers
One of six found in this puzzle
Stocking stuffer found in seven of this puzzle's longest answers
Second of two groups that may come in handy for this puzzle?
Main thoroughfare in Manhattan (one can be found in each of the four long answers in this puzzle)
Nickname of the man (born 2/12/1809) who gave the address at 18A, issued the 28A/45A, was the first elected president of the 60A Party, and whose name can be found in this puzzle's main diagonal
First of two groups that may come in handy for this puzzle?