load=2STW
define polar oxygen or nitrogen
define nonpolar carbon or phosphorus or sulfur
define sugar *.?*' and dna
define p_dna *.P or *.OP? and DNA
define minor_gr ((da and (*.C2 or *.N1 or *.C4 or *.N3 or *.N9)) or (dt and (*.N1 or *.N3 or *.C2 or *.O2)) or (dc and (*.N3 or *.N1 or *.O2 or *.C2)) or (dg and (*.N9 or *.C4 or *.C2 or *.N3 or *.N2 or *.N1))) and dna
define major_gr ((da and (*.C5 or *.C6 or *.N7 or *.C8 or *.N6)) or (dt and (*.C5 or *.C6 or *.C7 or *.C4 or *.O4)) or (dc and (*.N4 or *.C4 or *.C5 or *.C6)) or (dg and (*.C8 or *.N7 or *.C5 or *.O6 or *.C6))) and dna

select within(3.5, polar and sugar) and polar and protein
select within(4.5, nonpolar and sugar) and nonpolar and protein
 

select within(3.5, polar and p_dna) and polar and protein
select within(4.5, nonpolar and p_dna) and nonpolar and protein

select within(3.5, polar and major_gr) and polar and protein
select within(4.5, nonpolar and major_gr) and nonpolar and protein

select within(3.5, polar and minor_gr) and polar and protein
select within(4.5, nonpolar and minor_gr) and nonpolar and protein