Fix the gap
One letter pair in every word is spaced wrong. Find it and push it the right way before the pencil line runs out. Thirty words, and they get harder.
Pinch in on it (or left-click): too loose, close it up
Spread out on it (or right-click): too tight, add space
Push the broken gap the right way and it snaps into place. Anything else is a strike. Three strikes and the proof goes back to the printer. Watch the ligatures: a broken fi or st is a tell.
Landscape gives you the most room to work in.
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