CPC ke Duplicate Concepts: Res Judicata aur Bar on Second Action

Yaar samajh nahi aaya, kya aap bhi CPC ka Section 11 aur Section 20 ko samjhne mein problemat hai? Arey, hum to samajhne gaye hain ki res judicata ki idea Section 11 mein hai, lekin kya Section 20 bhi usi cheez ki baat karta hai? Ek case mein, Supreme Court ne kaha ki jo matter Section 20 ke under dismissed ho jaye, use wapas se nahi suna jaa sakta. Lekin kya yah Section 11 ki res judicata ke under aata hai? Toh kya Section 20 ka matlab hai ki koi matter dismissed ho jaye, use wapas se suna jaa sakta hai? Please help, koi samajh aata hai?