Ought to have the foremost apostrophe to mark the omission of digits but not the pluralizing apostrophe). now, partly due to being a programmer) do take the apostrophe when forming the plural. Illustrations that typically corroborate this, taken from the useless-tree American Heritage Dictionary It appears to be like as https://bookmarkyourpage.com/story5417013/used-cars-uk-things-to-know-before-you-buy