make_projdb_from_org_dataset( dSupport, pnFreqCount ) {
  foreach sequence {
    count number of sequences in nCount
    foreach itemset {
      foreach item {
        count nPatLen and nSeqLen
        # Count each item once for this sequence
        if(counter[item]->s_id < cur seq #) {
          counter[ item ]->count += 1 for this sequence
          counter[item]->s_id = cur seq #
          if this is NOT the last item in a sequence {
            # Keep count of inter-items
            inter_freq_count[item]++
          }
        }
      }
    }
    Keep track of the longest itemset (max_pat_len)
    keep track of the longest sequence, including -1's (nMaxSeqLen)
  }