Union Questions

Each row resolves to 'row 0 OR row 1'. Elements present in either parent (or both) appear in the result. Unlike XOR, shared elements do not cancel — they are kept.

• Row-2 cells contain every element that appears in row 0 OR row 1.
• No element is dropped in row 2 unless it was absent from both parents.
• Row 2 is often denser than either parent.

• A row-2 cell that 'looks like both parents combined'.
• Lines or dots that survive even when they appear in both parents.
• Often paired with conservation or Latin-square secondary rules.

1. 1List the elements in the two parent cells.
2. 2Combine the lists into a single set (no duplicates).
3. 3The result is the row-2 cell.
4. 4Verify by checking that every element in either parent appears in row 2.

• Confusing union with XOR — XOR drops shared elements; union keeps them.
• Forgetting that a single element appearing in both parents shows up only once in the union.
• Reading the cells in the wrong order — union is symmetric but the visual orientation can still confuse.