{HEAD ~ A suitable phenol formaldehyde} is {TAIL ~ m cresol formaldehyde} and a suitable sensitizer is a naphthoquinone diazide sulfonic acid ester 
is
{ HEAD ~ A suitable phenol formaldehyde } is { TAIL ~ m cresol formaldehyde } and a suitable sensitizer is a naphthoquinone diazide sulfonic acid ester
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