Logic, Constraint, Deduction, and Combinatorics
Deduction and parity become constraint elimination, logic grids, organized counting, trees, and product-rule readiness.
01Deduction entry
Use parity, sequence logic, and visible clues.
02Constraints
Eliminate impossible choices and organize remaining cases.
03Organized counting
List cases, draw trees, and prepare for product-rule reasoning.
04Related branches
Related skills that connect through the same family.