In a chapter 13 case, to participate in distributions from the bankruptcy estate, unsecured creditors must file their claims with the court within 90 days after the first date set for the meeting of creditors. Fed. R. Bankr. P. 3002(c).
They may have nylon or steel strings. The strings of a six-string guitar are tuned to E, A, D, G, B, E, a fourth apart except for the major third interval between B and G. Frets are placed by the fret rule one-eighteenth the remaining length of the string. This makes them a semitone apart.
the guitar is tuned the way it is to maximize it's potential with open strings. If you wanted perfect tuning, you could simply move the second string up to a C and the first string up to an F. The guitar would then be tuned in perfect fourths, all the up the string set. You would have a much more difficult time playing chords with open string however, and you would lose the doubled E strings.