Coding Pattern Analysis: SELFISH to TDMEJRI

The code follows an alternating pattern of adding and subtracting 1 from the alphabetical position of each letter.

• S $\rightarrow$ T (Position +1)
• E $\rightarrow$ D (Position -1)
• L $\rightarrow$ M (Position +1)
• F $\rightarrow$ E (Position -1)
• I $\rightarrow$ J (Position +1)
• S $\rightarrow$ R (Position -1)
• H $\rightarrow$ I (Position +1)

The identified pattern is: +1, -1, +1, -1, +1, -1, +1.

Encoding MONITOR Using the Pattern

Applying this +1, -1 sequence to encode 'MONITOR':

• M (+1) $\rightarrow$ N
• O (-1) $\rightarrow$ N
• N (+1) $\rightarrow$ O
• I (-1) $\rightarrow$ H
• T (+1) $\rightarrow$ U
• O (-1) $\rightarrow$ N
• R (+1) $\rightarrow$ S

Thus, 'MONITOR' is encoded as 'NNOHUNS'.