sentences:  Instead, new 74-gun and 64-gun ships replaced these classes.Although 50-gun and 44-gun two-deckers continued to be built for cruising duties, the Navy no longer considered the 50-gun ships powerful enough to serve as ships of the line.Note that from 1756 onward the 50-gun ships were no longer counted as ships of the line as the Navy no longer considered them powerful enough to stand in the line of battle.