Concatenate registered variable , variables in vara and strings

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I'm trying to concatenate registered variable from a previous task , external variable with a string ( ex: -stringhere) in a task.

I'm not getting the syntax to do it.

I tried below and it didn't work.

Command : echo {{ item.0 + "-" item.1 +"-stringhere"
With_items:
   - "{{ thevar.stdout }}
    - "{{ external var }}"

Please help with the syntax to do this.