In a certain code language, 'RESTRICT' is written as 'CTRISTRE', 'STARTING' is written as 'NGTIARST' and 'MOUNTAIN' is written as 'INTAUNMO'. What is the code for the word 'ENVELOPE' in that code language?

The logic is: We have to write 7th and 8th letter followed by 5th and 6th letter, then 3rd and 4th letter followed by 1st and 2nd letter. R             E              S              T              R             I               C             T 1              2              3              4              5              6              7              8 C             T              R             I               S              T              R             E              7              8              5              6              3              4              1              2 Similarly, S              T              A             R             T              I               N             G 1              2              3              4              5              6              7              8 N              G               T               I               A                R               S          T              7              8              5              6              3              4              1              2 Similarly, M              O             U             N               T               A                I              N          1              2              3              4              5              6              7              8 I                 N               T             A             U              N             M              O              7              8              5              6              3              4              1              2 Similarly, E                N               V              E              L              O              P             E          1              2              3              4              5              6              7              8 P                 E              L              O               V               E               E          N 7              8              5              6              3              4              1              2