There was an argument some time back somewhere around the time the ivory came out -- that a YB couldn't be called a YB (aka het ivory) unless it came from a proven ivory line. There were those that argued a YB is a YB and all will produce the ivory -- and those that insisted that only a proven YB line could be called a YB -- yes there are thousands of imported YBs every year -- will they all prove out -- who knows. And there in lies the distinction -- some lines have been proven out others are still "unproven".
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Tosha
JET Pythons

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