So, let's start: how many letters are there in the alphabet?
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Next, how do you pronounce the last syllable of the placename 'Cockenzie'?
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Do you agree?
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The Latin alphabet had 21 letters. It did not have 'j', 'u', 'w', 'x', 'y' or 'z'.
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No. It's more complicated than that.
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But, Icelandic also has no 'z'.
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Cockenzie also has no 'z'.
"Oh yes it does," you may say. "I can see it."
Oh no it doesn't.
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We know how to pronounce those words (well, maybe we've forgotten how to pronounce 'Shetland' and 'Cockenzie'). We know there's no 'z' sound in them.
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Well, one answer - the answer I was taught - was that in the sixteenth and seventeenth centuries, printers in Scotland used to buy their type from foundries in England, and those English type foundries didn't produce 'ȝ'.
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So, quick! Where would you look for a word starting with 'ȝ' in the dictionary? In the phonebook?
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So, should a Scots alphabet include 'ð'? I simply don't know. And are there other candidates? I don't know that either.