instante t = 0:
      1   2   3   4   5   6   7   8   9  10  11  12  13  14  15 

  1                                                             
  2                                                             
  3       X       X                                             
  4           X               X                                 
  5   X   X   X               X   X   X                         
  6                                                             
  7                                                             
  8                                                             
  9   X   X   X                                                 
 10           X               X   X   X                         
 11       X                   X                                 
 12                               X                             
 13                                                             
 14                                                             
 15                                                             

instante t = 1:
      1   2   3   4   5   6   7   8   9  10  11  12  13  14  15 

  1                                                             
  2                                                             
  3           X                                                 
  4   X           X           X                                 
  5       X   X               X   X                             
  6       X                       X                             
  7                                                             
  8       X                                                     
  9       X   X                   X                             
 10   X       X               X   X                             
 11                           X       X                         
 12                                                             
 13                                                             
 14                                                             
 15                                                             

instante t = 2:
      1   2   3   4   5   6   7   8   9  10  11  12  13  14  15 

  1                                                             
  2                                                             
  3                                                             
  4               X           X   X                             
  5   X   X   X               X   X                             
  6       X   X               X   X                             
  7                                                             
  8       X   X                                                 
  9   X       X               X   X                             
 10           X               X       X                         
 11                           X                                 
 12                                                             
 13                                                             
 14                                                             
 15                                                             

instante t = 3:
      1   2   3   4   5   6   7   8   9  10  11  12  13  14  15 

  1                                                             
  2                                                             
  3                                                             
  4       X   X               X   X                             
  5   X           X       X           X                         
  6   X       X               X   X                             
  7                                                             
  8       X   X                                                 
  9           X   X           X   X                             
 10       X               X   X                                 
 11                               X                             
 12                                                             
 13                                                             
 14                                                             
 15                                                             

instante t = 4:
      1   2   3   4   5   6   7   8   9  10  11  12  13  14  15 

  1                                                             
  2                                                             
  3                                                             
  4       X   X               X   X                             
  5   X           X       X           X                         
  6       X                   X   X                             
  7           X                                                 
  8       X   X   X                                             
  9               X       X   X   X                             
 10           X           X                                     
 11                           X                                 
 12                                                             
 13                                                             
 14                                                             
 15                                                             

instante t = 5:
      1   2   3   4   5   6   7   8   9  10  11  12  13  14  15 

  1                                                             
  2                                                             
  3                                                             
  4       X   X               X   X                             
  5   X                   X           X                         
  6       X   X               X   X                             
  7               X                                             
  8       X       X   X       X                                 
  9       X       X       X   X                                 
 10                   X   X       X                             
 11                                                             
 12                                                             
 13                                                             
 14                                                             
 15