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The message from the last obscure check or FALSE if there was no obscure checks made so far.

The returned message is one of:

• it's WAY too short
• it is too short
• it does not contain enough DIFFERENT characters
• it is all whitespace
• it is too simplistic/systematic
• it looks like a National Insurance number.
• it is based on a dictionary word
• it is based on a (reversed) dictionary word
• strong password