group
    selection=(
	(resid 1 and name N1) or
	(resid 1 and name N3) or
	(resid 1 and name C5) or
	(resid 21 and name N1) or
	(resid 21 and name N3) or
	(resid 21 and name C5)
    )
    weight=$planarweight
end

group
    selection=(
	(resid 2 and name N1) or
	(resid 2 and name N3) or
	(resid 2 and name C5) or
	(resid 20 and name N1) or
	(resid 20 and name N3) or
	(resid 20 and name C5)
    )
    weight=$planarweight
end

group
    selection=(
	(resid 3 and name N1) or
	(resid 3 and name N3) or
	(resid 3 and name C5) or
	(resid 19 and name N1) or
	(resid 19 and name N3) or
	(resid 19 and name C5)
    )
    weight=$planarweight
end

group
    selection=(
	(resid 4 and name N1) or
	(resid 4 and name N3) or
	(resid 4 and name C5) or
	(resid 18 and name N1) or
	(resid 18 and name N3) or
	(resid 18 and name C5)
    )
    weight=$planarweight
end

group
    selection=(
	(resid 5 and name N1) or
	(resid 5 and name N3) or
	(resid 5 and name C5) or
	(resid 17 and name N1) or
	(resid 17 and name N3) or
	(resid 17 and name C5)
    )
    weight=$planarweight
end

group
    selection=(
	(resid 6 and name N1) or
	(resid 6 and name N3) or
	(resid 6 and name C5) or
	(resid 16 and name N1) or
	(resid 16 and name N3) or
	(resid 16 and name C5)
    )
    weight=$planarweight
end

group
    selection=(
	(resid 7 and name N1) or
	(resid 7 and name N3) or
	(resid 7 and name C5) or
	(resid 15 and name N1) or
	(resid 15 and name N3) or
	(resid 15 and name C5)
    )
    weight=$planarweight
end