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###                                          ###
###   Brehm's vertex-minimal triangulation   ###
###   of the lens space                      ###
###                         L(3,1)           ###
###                                          ###
###   with f-vector  f=(12,66,108,54)        ###
###                                          ###
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L_3_1=[ [ 1, 2, 3, 4 ], [ 1, 2, 3, 10 ], [ 1, 2, 4, 9 ], [ 1, 2, 5, 6 ], 
  [ 1, 2, 5, 9 ], [ 1, 2, 6, 11 ], [ 1, 2, 10, 11 ], [ 1, 3, 4, 7 ], 
  [ 1, 3, 7, 8 ], [ 1, 3, 8, 10 ], [ 1, 4, 7, 9 ], [ 1, 5, 6, 12 ], 
  [ 1, 5, 7, 9 ], [ 1, 5, 7, 12 ], [ 1, 6, 11, 12 ], [ 1, 7, 8, 12 ], 
  [ 1, 8, 10, 11 ], [ 1, 8, 11, 12 ], [ 2, 3, 4, 12 ], [ 2, 3, 10, 12 ], 
  [ 2, 4, 8, 9 ], [ 2, 4, 8, 12 ], [ 2, 5, 6, 8 ], [ 2, 5, 8, 9 ], 
  [ 2, 6, 7, 8 ], [ 2, 6, 7, 11 ], [ 2, 7, 8, 12 ], [ 2, 7, 10, 11 ], 
  [ 2, 7, 10, 12 ], [ 3, 4, 5, 6 ], [ 3, 4, 5, 11 ], [ 3, 4, 6, 7 ], 
  [ 3, 4, 11, 12 ], [ 3, 5, 6, 8 ], [ 3, 5, 8, 9 ], [ 3, 5, 9, 11 ], 
  [ 3, 6, 7, 8 ], [ 3, 8, 9, 10 ], [ 3, 9, 10, 12 ], [ 3, 9, 11, 12 ], 
  [ 4, 5, 6, 10 ], [ 4, 5, 10, 11 ], [ 4, 6, 7, 9 ], [ 4, 6, 9, 10 ], 
  [ 4, 8, 9, 10 ], [ 4, 8, 10, 11 ], [ 4, 8, 11, 12 ], [ 5, 6, 10, 12 ], 
  [ 5, 7, 9, 11 ], [ 5, 7, 10, 11 ], [ 5, 7, 10, 12 ], [ 6, 7, 9, 11 ], 
  [ 6, 9, 10, 12 ], [ 6, 9, 11, 12 ] ]