Line Breeding - Page 1

Can someone tell me what are the closest you should go on line breeding?? eg. is 2-2, 3-3,3-3 good or bad? should breeding of this kind be done. The KC say you cant register a litter from say father & daughter or son & mother but you can from 2 dogs with the same mother or the same father, is this right?? 

for 2-2 you have to take permission from SV. Sv allows if the case is strong enough. Rest is all allowed

regards