XOR Questions

Row 2 contains exactly the elements that appear in row 0 OR row 1 — but not both. Elements that appear in both parents cancel out. XOR is symmetric (swapping row 0 and row 1 gives the same result), which distinguishes it from subtraction.

• Two parent cells share some elements and differ on others.
• Row 2 looks 'sparser' than the union of the two parents.
• Elements present in exactly one parent always carry through.

• Dot-pattern or line-grid questions where elements cancel.
• Cells whose union would be 'crowded' but whose actual content is thinner.
• A clear cancellation step when comparing parents element by element.

1. 1List the elements present in row 0 and row 1 cells of the column.
2. 2For each element, check 'is it in both?' If yes, drop it.
3. 3Elements in exactly one parent appear in row 2.
4. 4Confirm by re-applying the rule to a different row.

• Confusing XOR with union (OR) — union keeps shared elements; XOR drops them.
• Confusing XOR with subtraction — XOR is symmetric, subtraction is not.
• Misidentifying which elements are 'shared' when positions differ slightly.