[j-nsp] JNCIP question: what's the area 49.0003 in ISIS case study?

[Min]

( for Harry's JNCIP book)

hey all,

I've been puzzled on this for a while. r3/r4 is in area 49.0002 and r5
in area 49.0001, so what's area 49.0003 for? it appears in the
criteria as:

"The subnet between r3 and T1 must appear in area 49.0003 as an
internal route. Ensure that no adjacencies can be established on this
subnet."

what does that mean? seems the sample config desn't reflect 49.0003.
am I missing something?

Min