ƚ` N G .  `&` & MathTypeP-hhL -T-RFRFR&hL-T+-3RRR_TSymbol ww 0wfB-2 (yTSymbol# ww 0wfB-2 })yh L -T  - Ru Ru RUhL-T -(RRRTTimes New Romanww 0wfB-2 3y2 2y2  6y2  2y 2 I  2 -OR 2  2 3 2 X6 2 :2 Symbolk ww 0wfB-2 + 2 + & "SystemBfB !-