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|   |   |   |   |   |   H   |   
|   |   |   |   |   H   |   |   
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|   O---O---Ry--+---+---+---@   
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|   |   |   |   H   |   |   |   
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NOTA	next write h.c.
|   |   |   |   <--->   |   |   
|   |   |   |   <---+--->   |   
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|   |   |   |   H   |   |   |   
|   O---O---Ry--@   |   |   |   
|   O---O---Ry--+---@   |   |   
|   O---O---Ry--+---+---@   |   
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|   |   |   |   H   |   |   |   
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