P28a @ X ←oA)HI

P28a @ X ←oA)HL ½ = @ @ H— @ @@

P28a @ X ←oA)HI ½ = @ X A A @@ x z N  ÷  P XIGB

P28a @ X ←oA)HL x * M  ÷  P X←GB

P28a @ X ←oA)HL ½ X @ ↑ & @@  ÷ * % x z N  ÷  P XIGB

P28a — @@ X ½Lv @ @ @  @ xr z&* @ Kqj=8) @

P28a P @@ X ½‖g  @ @ @ xr z&* @ Kqj=8) @

P28a — @@  ½LQ @ I E   T @ xr z&* @ Kqj=8)