output file after Pythia8

Hello,
I would like to ask a question about my output file after Pythia8 and Fastjet package.
Here is my process, and I set the b-jet tagging efficiency to be 0.5, etc.
e+ e- > z > mu+ mu- b b~
and there is one of an event of my output lhe file:

<event>
10 9999 2.0330582E-02 -1.0000000E+00 -1.0000000E+00 -1.0000000E+00
      -11 -1 0 0 0 0 0.00000000000E+00 0.00000000000E+00 0.12500000000E+03 0.12500000000E+03 0.00000000000E+00 0.00000 0.00000
       11 -1 0 0 0 0 0.00000000000E+00 0.00000000000E+00 -0.12500000000E+03 0.12500000000E+03 0.00000000000E+00 0.00000 0.00000
       23 3 1 2 0 0 -0.28245897293E+02 -0.34270095825E+02 -0.56868759155E+02 0.11781208038E+03 0.93130874634E+02 0.00000 0.00000
        5 3 3 0 0 0 -0.42356693268E+02 -0.57438846588E+02 -0.25159151077E+02 0.75818092346E+02 0.46999998093E+01 0.00000 0.00000
       -5 3 3 0 0 0 0.14110794067E+02 0.23168748856E+02 -0.31709609985E+02 0.41993984222E+02 0.46999998093E+01 0.00000 0.00000
      -13 1 1 1 0 0 0.45481678009E+02 -0.24208650589E+02 0.48300380707E+02 0.70622802734E+02 0.10812854022E+00 0.00000 0.00000
       13 1 1 1 0 0 -0.17235782623E+02 0.58478744507E+02 0.85683784485E+01 0.61565120697E+02 0.10590311140E+00 0.00000 0.00000
        5 1 0 0 0 0 0.13262925148E+02 0.20932399750E+02 -0.28742380142E+02 0.38720001221E+02 0.76839790344E+01 0.00000 0.00000
        5 1 0 0 0 0 -0.42040241241E+02 -0.55896102905E+02 -0.25155992508E+02 0.74772369385E+02 0.81441421509E+01 0.00000 0.00000
       12 1 0 0 0 0 0.00000257045E+00 0.00000314834E+00 0.00000000000E+00 0.00000406439E+00 0.00000000000E+00 0.00000 0.00000
</event>

I am wondering the how is the difference and ordering of two b-jets? I mean, is there some collider kinemetics ordering of first and the second output of “5” (b-jets)?

Thanks.