Enter : #1
  Enter : #2
  Enter : #3
  Enter : #4
  Enter : #5
  Enter : #6
  Exit : #6 : low = 4
  Stack:
    1, 2, 3, 4, 5, 6, 
  Exit : #5 : low = 3
  Stack:
    1, 2, 3, 4, 5, 6, 
  Exit : #4 : low = 3
  Stack:
    1, 2, 3, 4, 5, 6, 
  Found a New BCC #1.
    BCC #1 has vertex #6
    BCC #1 has vertex #5
    BCC #1 has vertex #4
    BCC #1 has vertex #3
  Enter : #7
  Enter : #8
  Exit : #8 : low = 3
  Stack:
    1, 2, 3, 7, 8, 
  Enter : #9
  Exit : #9 : low = 7
  Stack:
    1, 2, 3, 7, 8, 9, 
  Found a New BCC #2.
    BCC #2 has vertex #9
    BCC #2 has vertex #7
  Exit : #7 : low = 3
  Stack:
    1, 2, 3, 7, 8, 
  Found a New BCC #3.
    BCC #3 has vertex #8
    BCC #3 has vertex #7
    BCC #3 has vertex #3
  Exit : #3 : low = 1
  Stack:
    1, 2, 3, 
  Exit : #2 : low = 1
  Stack:
    1, 2, 3, 
  Found a New BCC #4.
    BCC #4 has vertex #3
    BCC #4 has vertex #2
    BCC #4 has vertex #1
  Exit : #1 : low = 1
  Stack:
    1, 
  Enter : #10
  Enter : #11
  Enter : #12
  Exit : #12 : low = 11
  Stack:
    10, 11, 12, 
  Found a New BCC #5.
    BCC #5 has vertex #12
    BCC #5 has vertex #11
  Exit : #11 : low = 10
  Stack:
    10, 11, 
  Found a New BCC #6.
    BCC #6 has vertex #11
    BCC #6 has vertex #10
  Exit : #10 : low = 10
  Stack:
    10, 
  Enter : #13
  Exit : #13 : low = 13
  Stack:
    13,