Do actors memorize the entire script?

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6. What is mnemonic phrase?
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1. #before
2. #answers
3. #entire
4. #memorize
5. #actors
6. #practice
7. #unless
8. #better
9. #things
10. #script
11. #memory
12. #shooting
13. #generally
14. #performing
15. #starts
16. #memorizing
17. #those