Crossword puzzle clue "bi times four"

Collection consisting of four plates, four saucers, four bowls, etc.

Only tennis player who has won all four Grand Slam titles at least four times each

City where four presidents and four vice presidents served as governor

Skeletal parts, four of which can be found in rows four, seven, nine, and twelve

Four-four, e.g.

Word that's "shifted" in the first four letters of the four longest answers

Four-for-four Super Bowl-winning QB

Angle irons graphically represented by four sets of black squares in this grid, and by letter formations starting in the four longest answers