If in a certain code language: "SCHOOL" is coded as 'HCSLOO' and "MEDIUM" is…

The coding pattern involves swapping the first and third letters, followed by swapping the fourth and sixth letters.

For "SCHOOL", swapping S and H yields HCSOOL, then swapping O and L results in HCSLOO.

Similarly, "MEDIUM" clearly transforms to DEMMUI using the same logic.

Applying this to "TABLES", swapping T and B gives BATLES, then swapping L and S produces BATSEL.