Should I learn AngularJS or Angularjs 4?

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2. #typescript
3. #share
4. #frameworks
5. #independent
6. #framework
7. #learn
8. #answers
9. #angular
10. #understanding
11. #while
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13. #angularjs
14. #concepts
15. #javascript
16. #start
17. #learning
18. #though
19. #other
20. #vanilla
21. #before