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| Suppose A has a 1 and B has a 0 in the current location. |
| The glider in the A stream kills the glider in the glider gun stream, so the glider gun stream transmits a 0 to B. |
| But there is no glider in the B stream to pass through the gap in the glider gun stream, so the current location of A and B is 0. |
| That is, if A is 1 and B is 0, then A and B is 0. |
Return to the and operation.