#!/usr/bin/gawk -f

BEGIN {
  n = 0;
}

/^\[[0-9a-z]+\]/ {
#    printf("%d: %s\n", n, $0);
  if (n && int(n / 10) * 10 != n) {
    print $0;
  } else { 
    getline;
  }
  n++;
  next;
}

{
  print $0;
}