Table: order of battle for convoy sc 7
[['name', 'class', 'navy', 'date joined', 'date departed'], ['hms bluebell', 'flower class corvette', 'royal navy', '18 october', '21 october'], ['hmcs elk', 'armed yacht', 'royal canadian navy', '5 october', '7 october'], ['hms fowey', 'shoreham class sloop', 'royal navy', '18 october', '21 october'], ['hms heartsease', 'flower class corvette', 'royal navy', '18 october', '21 october'], ['hms leith', 'grimsby class sloop', 'royal navy', '18 october', '21 october'], ['hms scarborough', 'hastings class sloop', 'royal navy', '5 october', '21 october']]
Statement: Hm Bluebell , Hm Fowey , Hms Heartsease and Hm Leith all Joined on 18 October and Departed on 21 October
Statement: Hm Bluebell is Class Flower class Corvette while Hmcs Elk is an Armed Yacht
Statement: the Armed Yacht and the Hastings Class Sloop may have Joined at the same time but Hmcs Elk , Class Armed Yacht Departed 14 day earlier
Statement: Hmcs Elk , the only Royal Canadian Navy was the onle 1 who daparted on 7 October
Statement: Hmcs Elk is the only Royal Canadian Navy , the 5 others are Royal Navy