Duplicate information

[jcorreaa]

Hi everyone, I am new to this and maybe someone help me with this super simple question.

I have a table with this information

_c0 _c4
0 b
0 g
0 f
1 a
1 f
1 c
2 f
2 e
2 a
2 c

and I need to move this way. I mean, How can group this duplicate information in a list? :

_c0 lista
0 b,f,g
1 a,c,f
2 a,c,e,f

Thanks for support me!!!

Jalena.