You are a bit off there. Whilst technically some razee frigates and bigger frigates carried over 50 guns they were mostly classed as 44-gun 5th rates. 4th rates were ships of the line, though only really 60 gun ships were used in the line of battle by most nations. And 5th rates also included 2 decked 44-gun cruising style vessels as well which were mostly used by the Royal Navy. 3rd rate 80-gunners could also be 3-deckers in the Royal Navy during the first half of the century.
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