restrict none 
select dna, *:b
backbone 50
select dna
wireframe 50
echo press enter
pause
define set1 *.o5*                                    
select set1                                         
cpk 200                                             
color cyan                                          
echo set1           
echo press enter                   
pause                                               
define set2 (*.o1p,*.o2p) and dna                   
select set2                                         
cpk 200                                             
echo set2      
echo press enter                   
pause                                               
define set3 (*.n1,*.n2,*.n3,*.n6,*.n7,*.n9) and dna 
select set3                                         
cpk 200 
echo set2
select within 
                                            