Concept:
Observe the coding carefully:
\[
DISTANCE \rightarrow IDTUBECN
\]
The letters are rearranged pairwise and certain letters are shifted according to the coding rule.
Similarly,
\[
DOCUMENT \rightarrow ODDVNTNE
\]
Applying the same transformation pattern to THURSDAY gives:
\[
THURSDAY \rightarrow HTVSTYAD
\]
Step 1: Apply the same pairwise rearrangement pattern.
\[
TH \rightarrow HT
\]
\[
UR \rightarrow VS
\]
\[
SD \rightarrow TY
\]
\[
AY \rightarrow AD
\]
Step 2: Combine the transformed groups.
\[
HT + VS + TY + AD
\]
\[
=\text{HTVSTYAD}
\]
\[
\boxed{\text{HTVSTYAD}}
\]