Remove First and Last character from List

How to remove the first and last character from de loop of this list?

If possible show any one item from the list properly instead of showing like this… Orelse why do you join that character and now you feel suffer to remove it

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Basically I need the list of VALUES to insert several installments in mysql in just 1 query, adding 1 month of difference between each installment.


I managed to solve it using Join Items.