The list represents the first letter of the name of a numerical increment.
Or...
Over the trees flew forty seven silver eagles.
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The next two letters are likely C & U. There are at least 2 patterns in these letters. FIrst is the list of vowels that make up every other letter. Then the letters alternate from the ends of the alphabet. If there is a Z, a B, then a Y, then C would likely be next, and then X. But there would be whatever vowel in sequence next.
HHLBBCNOFNSMASP The first letters of each of the elements. hydrogen, helium, lithium, beryllium, boron, carbon, nitrogen...
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Alpha and beta are the first two letters of the Greek one...
Kansas becomes Arkansas by adding two letters