Question 74
Use uppercase A–Z, lowercase a–z, digits 0–9 and punctuation +, −, @, *, =, #, period. Rules: punctuation positions stay as in the model; every series ends in a period; no adjacent uppercase letters; at most seven characters; a lowercase letter may be replaced by a digit. Model as printed: SbbR=N (no final period). Check all four series in the illustration and explain C (correct) or I (incorrect). AI reconstruction for this exercise: use the completed model SbbR=N. with seven positions; the fifth position may contain any allowed non-period punctuation, and the seventh is a period. Ignore display spaces. These details repair the missing model period and make the source’s punctuation-position rule explicit.
