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One can imagine the tired scribe's eyes glossing over, as the candle-light flickers hypnotically. He has already just copied the line in green only a notch or two above, mentally preparing him to glance at the omitted line and identify it as already done.
He glances back to the exemplar, searching for the line-end for the next row, and latches onto the wrong spot, losing two lines in the process. All is well in Alexandrian la-la land.
Hort is too embarrassed to discuss the homoeoteleuton gaffe, but does not hesitate to follow the omission anyway, without attention-drawing comments.