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| Suppose A has a 0 and B has a 1 in the current location. |
| The hole in the A stream lets the glider from the top glider gun stream through, so a 1 is transmitted to B. |
| The glider in the B stream kills the glider in the top glider gun stream, so a 0 is transmitted to the left glider gun stream. |
| The glider in that stream passes through the hole in the top glider gun stream, contributes a 1 to the current location of A or B. |
| That is, if A is 0 and B is 1, A or B is 1. |
Return to the or operation.