[
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    "N":108,"start":0,"end":51,
    "trk":TRK_RECV,"xorval":0x00001407,
    "r_low":{
      "bits":23,"v":0x002004B2,"railstatus":"closed","n":2,
      "b_short":{"inf":474,"mid":1264,"sup":1848},
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    },
    "r_high":{
      "bits":22,"v":0x002010B5,"railstatus":"stop received","n":2,
      "b_short":{"inf":450,"mid":1200,"sup":1816},
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      "b_sep":{"inf":3280,"mid":5248,"sup":65535}
    }
  }
  {
    "N":108,"start":0,"end":105,
    "trk":TRK_RECV,"xorval":0x00001407,
    "r_low":{
      "bits":26,"v":0x010004B2,"railstatus":"closed","n":2,
      "b_short":{"inf":474,"mid":1264,"sup":1848},
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    "r_high":{
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]
