define set1 (*.O? and DNA) 
define set2 (*.OP?)
define set3 (*.N? and DNA)
restrict all
pause 
restrict dna
cpk 0
pause 
restrict dna
cpk 0
select set1 
cpk 200
pause 
restrict dna
cpk 0
select set2 
cpk 200
pause
restrict dna
cpk 0
select set3 
cpk 200