A line-mending reaction is a mechanism that can fully mend a sealed gap in an infinite diagonal line of cells, such as the one produced by a line-cutting reaction. Such a reaction is demonstrated below, in two stages. The second stage can be subdivided if necessary, at the cost of two additional gliders. See BNE14T30 for one way of creating the gliders travelling parallel to the lines.
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RLE: here Plaintext: here