There are 4 or 5 frigates whose names start with a C and 3 or 4 of them with CON. That could be adjusted. Yes, it won't be historical but it would make for easier play.
Or we could use a smarter abbreviation algorithm instead of "pick first 3 letters". A smarter one which avoids duplicates could come up with: CHE CON PRE UNI CNG CST
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