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L = thisComp.layer("the layer");
max = 5; // number of words to display
n = 0
  if (L.marker.numKeys > 0){
    n = L.marker.nearestKey(time).index;
    if (L.marker.key(n).time > time){
      n--;
    }
  }
s = " ";
if (n > 0){
  base = Math.floor((n-1)/max)*max + 1;
  for (i = base; i < base + max; i++){
    if (i <= L.marker.numKeys){
      s += L.marker.key(i).comment + " ";
    }
  }
}
s