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Trying to parse operand for ":" operator

Hello, I have the next line of code: 

 

g_list[j] = dt << Group Columns(: || char(test_list[j]) || char(_) || char(s_list[1]), Length(s_list));

The line is generating the next problem: 

Unexpected "||".
Trying to parse operand for ":" operator

What is the best way to fix the issue?

Thanks a lot

Re: Trying to parse operand for ":" operator

I found the problem:
There is no need to parse the  : operator. The way I should do it is like that: 

g_list[j] = dt << Group Columns(:(test_list[j] || "_" || s_list[1]), Length(s_list))