Those chips being 74xx00 (Quad 2-input NAND), 74xx02 (Quad 2-input NOR), 74xx08 (Quad 2-input AND), and 74xx32 (Quad 2-input OR)
Extra unused gates have their inputs tied to ground, and are not shown in this schematic
LEDs:
•Top = Q
•Bottom = NOT Q
Logic Sources:
•Top = J
•Middle = CLK
•Bottom = K
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