バードの配列表記
もし [ A ∗ ] > [ B ∗ ] {\displaystyle {\displaystyle [A*]>\displaystyle [B*]}} なら [ A ] > [ B ] {\displaystyle {\displaystyle [A]>\displaystyle [B]}} 、 [ A ∗ ] < [ B ∗ ] {\displaystyle {\displaystyle [A*]<\displaystyle [B*]}} なら [ A ] < [ B ] {\displaystyle {\displaystyle [A]<\displaystyle [B]}} 、それ以外は [ H ] = [ A ∗ ] = [ B ∗ ] {\displaystyle [H]=[A*]=[B*]} としStep 4へ。
Step 4.もし N u m ( H , A 2 ) > N u m ( H , B 2 ) {\displaystyle \mathrm {Num} (H,A_{2})>\mathrm {Num} (H,B_{2})} なら、 [ A ] > [ B ] {\displaystyle [A]>[B]} 、 N u m ( H , A 2 ) < N u m ( H , B 2 ) {\displaystyle \mathrm {Num} (H,A_{2})<\mathrm {Num} (H,B_{2})} なら、 [ A ] < [ B ] {\displaystyle [A]<[B]} 、それ以外はStep 5へ。