I am a little confused on how to follow the set of rules/ parameters? any help would be great thank you!

N = { , , } T = { a, b, c,1,2,3} P = the productions 1. -> 2. -> 3. -> 4. -> a 5. -> b 6. -> C 7. -> 1 8. -> 2 9. -> 3 S = With the above grammar, which of the following identifiers would be valid from left to right separated by single spaces? 1234 123a a123c 1c23 3b21a a3b 2ba2 b 221a 23b2