Using freeCommander’s (freebie) multi rename tool how do I remove N characters from the beginning & N characters from the end of a file?

Using FreeCommander’s (freebie) multi rename tool how do I remove the first 3 characters & the last 2 characters of a file name in one go?

Original:
abcdefghij.mp3

Desired result:
defgh.mp3

I searched the help, but could find nothing relevant