select (p_sugar and within(3.5, p_protein)) or (p_protein and within(3.5, p_sugar))
select (np_sugar and within(4.5, np_protein)) or (np_protein and within(4.5, np_sugar))

select (p_PO4 and within(3.5, p_protein)) or (p_protein and within(3.5, p_PO4))
select (np_PO4 and within(4.5, np_protein)) or (np_protein and within(4.5, np_PO4))

select (p_maj and within(3.5, p_protein)) or (p_protein and within(3.5, p_maj))
select (np_maj and within(4.5, np_protein)) or (np_protein and within(4.5, np_maj))

select (p_min and within(3.5, p_protein)) or (p_protein and within(3.5, p_min))
select (np_min and within(4.5, np_protein)) or (np_protein and within(4.5, np_min))