Lists of similar numbers can cause problems . Some years ago a large brewery in the midlands, which is now , I gather, a housing estate, had a bit of a disaster with similar numbers. They used a water treatment system to obtain the correct water composition for brewing. This system had to be regularly regenerated by passing through a solution of a commercial chemical . Can't remember the number but say it was XXX 21. When the time came for treatment one day the operator couldn't find any XXX 21, but there was XXX 22. He thought "that will be ok, must be similar" and treated the plant with XXX 22. Unfortunately XXX 22 was a completely different chemical , a detergent. Not poisonous or anything , but, as pub landlords and others will be aware, detergents, or fat, on a glass, or in a beer, result in no head. The result was over half a million bottles of beer that tasted fine and still had a very nice taste, but which, on pouring, gave no head whatsoever.