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That page says "... we adopted the vertical stroke and right angle of the interior counters, which contrast nicely against the rounded curves of the exterior stroke," and gives the example of the capital 'B' from the IBM logo. But the actual font doesn't do that at all. The 'interior counters' are rounded in the capital 'B' of the font.

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It's worded somewhat poorly but you can see what they mean if you look at the terminals of the "a", "t", "j", and "f", for example, which combine a right angle on one side and a curve on the other. They took the idea from the counters, but didn't apply them to counters. (The counters themselves however are a little more vertical than most fonts).

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