Many links are not working

[suryasr007]

The following links are not working and the concepts are also not available. Is it under progress?

4. Objects and Data Structures
5. Classes
   1. S: Single Responsibility Principle (SRP)
   2. O: Open/Closed Principle (OCP)
   3. L: Liskov Substitution Principle (LSP)
   4. I: Interface Segregation Principle (ISP)
   5. D: Dependency Inversion Principle (DIP)
6. Don’t repeat yourself (DRY)

[suryasr007]

Closing this as it has been resolved in #4