[
  "O",
  "B-changing value",
  "I-changing value",
  "B-device",
  "I-device",
  "B-duration",
  "I-duration",
  "B-living_space",
  "I-living_space",
  "B-target number",
  "I-target number",
  "B-time at",
  "I-time at"
]