In a certain code language, 'FLEECE' is written as 'EFCLEE' and ‘OVERCOAT’ is written as ‘TOAVOECR’. How will 'MITTEN' be written in that language?

NMEITT

The pattern followd here is;

( 1st letter shift to 2nd, 2nd to 4th, 3rd to 6th, 4th to 5th, 5th to 3rd and 6th to 1st)

So,

that's how we get 'FLEECE' is written as 'EFCLEE' 

And,

‘OVERCOAT’ is written as ‘TOAVOECR’

Similarly,

'MITTEN' be written as NMEITT