Maximum length of suboptions
The "normalized length", which is defined as the sum of the lengths of all
message IDs, plus the number of message IDs minus one, must not exceed 75.
This length is equivalent to the most compact specification possible, with
only a single delimiter separating suboptions and no unnecessary blank-padding
used. For example, the normalized length of
PermitLangx(IKF1150I IBM-E,IGY-E )