• • • ↑ ↓ ↑ • • • • • • • • • • • • 4 → 2 ↓ ↑ → → • • • • → ↓ ↑ • > 29 • • • • • < 29 • • • • • • • • • • • • • • • → → → → → → → → → ↑ ↓ ↑ f c 4 4 0 C C C C 6 5 2 4 O O 7 3 2 Cl N N N ↑ 1 6 1 • • 1 0 H ✓ ✓ ✓ → → → → ✓ • • → → → → • • • • • • → → • • → → → → → → → → → → • • • → → → → → → → H H H H I I H H H + O H + H H O -ve +ve → → → → → → → → I I O O H H → → • • → ↑ ↓ → → • • ↑ ↑ ↓ ↓ • ↑ • ↓ → → → → → → → → → → → → ✓ ✘ ✘ ✓ ✓ ✓ → ✘ ✘ , → → → → ↑ ↑ ↓ ↑ ↓ → → → < ↑ ↓ ↑ > • • • • → • → → → → → → → > < → → → → → → → ↓ ↓ ↓ ↓ → → → → → → → → → → → → → • • • • • • • • • • • • • • → → → > → → → → → → → →