 Monument 23 was damaged in the mid @-@ twentieth century by a local mason who attempted to break its exposed upper portion using a steel chisel . As a result , the top is fragmented , although the broken pieces were recovered by archaeologists and have been put back into place . 
 Monument 23 was damaged in the mid @-@ twentieth century by a local mason <a href='null_relcl' title='1'><mark>who</mark></a>attempted to break its exposed upper portion using a steel chisel . As a result , the top is fragmented , although the broken pieces <a href='uninflect' title='2'><mark>were</mark></a> recovered by archaeologists and <a href='been_done' title='3'><mark>have</mark></a> been put back into place . 
Monument 23 was damaged in da mid @-@ twentieth century by a local mason attempted to break its exposed upper portion usin a steel chisel . As a result , tdatop is fragmented , although the broken pieces was recovered by archaeologists and done been put bck into place .