Seasonal Role on Resume

I was working as a Tesco assistant before and after my internship, so my internship was sandwiched inbetween. 

I finish uni and went to work at Tesco then did my internship. When my internship finished I went back to Tesco to work as an assistant before heading back to uni.

When listing this on my CV:

-   Should I put the experience at Tesco twice (before and after my internship)

or

- Should I put two dates together under the Tesco experience heading? 

Thanks in advance