[tex-k] Typo in "TeX the program" (Volume B)
Igor Liferenko
igor.liferenko at gmail.com
Mon Apr 23 03:01:10 CEST 2018
Section 49 states:
at least 81 printable characters are needed
Let's check:
Both
'41-'46, '60-'71
and
'141-'146, '160-'171
code ranges are excluded from "add or subtract '100" rule, so
both these ranges must be present.
Further, '136 must be present (thus, '036 need not be present).
A total of 33 codes.
Then we need any mixture from the following two sets, to cover each
corresponding position:
'0-'35, '37-'40, '47-'57, '72-'77
'100-'135, '137-'140, '147-'157, '172-'177
Each of these sets has 47 positions (30+2+9+6).
So, we have 33+47=80 codes. All the conditions are satisfied.
80 is less then 81.
Regards,
Igor
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