code: protected <C extends Compound> boolean canComplement(Sequence<C> sequence) {
  		CompoundSet<C> compoundSet = sequence.getCompoundSet();
  		Compound c = compoundSet.getAllCompounds().iterator().next();
  		return ComplementCompound.class.isAssignableFrom(c.getClass());
  	}
docs: Uses the Sequence's CompoundSet to decide if a compound can
  be assgined to ComplementCompound meaning it can complement