Why same Wax , Way ,Waa for each step

Course Q&A Deep Learning Specialization Sequence Models
1

H​i

why same Wax , Way ,Waa for each step/word here, why they should be same ,

p​ls help

2

They aren’t the same for each word. The weights for each word are all included in the same weight matrices.

3

He is saying at 1:42 , that these parameters will be used again for each time step, isn’t that mean, the Waa for first word is same for second word too?