Context Free Grammar (eliminate the unit of production rules)

[zulkifli]

I have grammar

S → ABaC | BaC | AaC | ABa | aC | Aa | Ba | a
A → B | C | BC
B → b
C → D
D → d

Can someone please help me to eliminate all the rules of grammar production unit. Thanks for help!

 

[I like Serena]

I have grammar

S → ABaC | BaC | AaC | ABa | aC | Aa | Ba | a
A → B | C | BC
B → b
C → D
D → d

Can someone please help me to eliminate all the rules of grammar production unit. Thanks for help!

Welcome to PF, zulkifli!

Did you try anything?
What do you think you should do?
We can help you better if we can tell what it is you're having difficulties with...

 

[chiro]

Hey zulkifli and welcome to the forums.

Some quick hints is to simplify the last three tokens (as they just point to single elements and can be substituted) and then to simplify the OR statements by recognizing duplicate entities and other simplifications.