Decode the Cells

HI

I have working sheet wherein the task is given to decode the values to find a hidden word, as I am not aware about the decoding so just seeking help to understand

Attached is the excel sheet for reference

Try this in B10 and copy down:

=RIGHT(A10)&VLOOKUP(MID(A10,3,1)&MID(A10,2,1),$N$3:$O$7,2,0)&LEFT(A10)

B17:

=B10&B11&B12&B13&B14