Enter Security Code 
Guess the letters and
numbers (passphrase riddle)
--
((??? - 10) / 4) = -2.25
and not a
'D',
but
-v-,
2 chars before U
and then
small 'U' +2 letter(s)
followed by
small 'B' +3 letter(s)
followed by
1 chars before small B
-

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