Line Breeding

Borthers and sister, this is what the BS friend told me .
In line breeding, starts----mate fahter broad cock - mother broad hen = out comes F1 cock and F1 hen___ so now we bring back F1 hen to mate the father and F1 cock to mate the moter ==F2's
F2cock and F2hen from father side---------F2cock and F2hen from mother side
we mate F2cock fahter side------to---------F2hen mother side and F2hen father side mate to F2cock mother side== F3's
F3cock and F3hen father side----------------F3cock and F3hen mother side
we mate F3cock father side------------------F3hen mther side and F3hen father side mate to F3cock mother side==F4's
F4's=pure
F4= boad cock and broad hen
so bro, what do you think,you can handle this. This take three to four year breeding or do you have a better idea than this BS guy.==