0
Anonymous
if you read each term out:
z = "one zed" = 1z
1z = "one one, one zed" = 111z
111z = "three one, one zed" = 311z
so the next one is
311z - "one three, two one, one zed" = 13211z
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The next character in the series, "1Z Y2 3X W4 5V" is "U6".