In a certain code MISSIONS is written as MSIISNOS.How is INTERNET written in that code?

Explanation

Original:  M I S S I O N S  

Coded:     M S I I S N O S

It seems the first and last letters stay in place:  

- M → M, S → S

Now let's look at the rest:

Original: I S S I O N  

Coded:    S I I S N O (shuffled)

On close inspection, the letters are being rearranged by:

- Keeping 1st and 8th in place

- Swapping 2nd with 3rd, 4th with 5th, 6th with 7th

Apply the same pattern to the INTERNET:

Original: I N T E R N E T  

1st & 8th stay: I _ _ _ _ _ _ T

Now group and swap:

- 2nd & 3rd: N ↔ T → T N  

- 4th & 5th: E ↔ R → R E  

- 6th & 7th: N ↔ E → E N

Final code: I T N R E E N T

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