Crossword Clue:

in sets of four

AnswerCrossword Clue
BORDERRIVERIt may straddle neighboring countries ... and, in a different way, what each of four sets of puzzle circles graphically depicts
LBARSAngle irons graphically represented by four sets of black squares in this grid, and by letter formations starting in the four longest answers
QUARTETSSets of four
DOWNSNFL sets of four
SUITAny one of four familiar sets.
LEAPINLIZARDSClassic comics catchphrase ... and a hint to four sets of puzzle circles
STRINGQUARTETClassical music group ... or what the four sets of circled letters make up?