the day's book, sorted by ticket:
  1101   3.50 kg  reguler
  1102   2.00 kg  kilat
  1103   6.25 kg  reguler
  1104   8.00 kg  kilat
  1105   1.50 kg  setrika
  1106   4.00 kg  reguler
  1107   2.75 kg  setrika
  1108   5.00 kg  reguler
  1109   7.50 kg  reguler
  1110   3.00 kg  kilat
total weight: 43.50 kg
shifts done by all insertions: 3  (worst case would be 45)

collect ticket 1104: 8.00 kg kilat  (4 probes)
collect ticket 1110: 3.00 kg kilat  (4 probes)
collect ticket 1120: not in today's book  (4 probes)
