 The final cost of the dam was significantly less than had been originally budgeted for , and the work was completed on schedule to a date that was calculated seven years previously . 
 The final cost of the dam was significantly less than <a href='been_done' title='1'><mark>had</mark></a> been originally budgeted for , and the work was completed on schedule to a date <a href='null_relcl' title='2'><mark>that</mark></a>was calculated seven years previously . 
The final cost of da dam was significantly less den done been originally budgeted fir , and the work was completed on schedule to a date was calculated seven yrs previously .