row1 1 A B C D row2 swap 1 A C D B row3 swap alias 1 D C1 B1 A row4 alias 1 D C1 B1 A row5 other 1 model 3 A B1 C1 D E B C model optimized 2 A E D B 5 B B1 C 5 C C1 transform strategy 2 C1 pairs 2 A B pairs2 2 A C merge 2 B1 B direct 2 rels 2 C E D B A rename 2 old 2 A C1 B1 D new 2 D A C B concepts considers 1 first add 2 A B second check prec 2 B A A B third merge 2 B1 A B next transform 1 B1 5th ignore 2 B2 B A B1 test B[2] 3 ? 6th ? 2 ? B2 A B B1 B2 next transf concept 1 1-check if renamed? 2 A B=B1 next2 transf 1