Full Scale Lab - Task 1.2 - Virtual-Links

The following notes are listed in the full scale lab - solutions for task 1.2. Can someone explain the "disjoint OSPF area design"? I noticed the virtual-links connect R1/R3 and R2/R4. There is already a OSPF neighbor and adjacency on the connected interface. Why do we require virtual links? I see the notes for area 10/area 121 to exchange Type 3 and the loopback notes. However, is the reason for connecting to Area 0, which is located on R3 and R4?  

"The virtual-links configured here fix the disjoint OSPF Area design used by this lab. Area 10 and 121 will be able to exchange Type-3 LSAs, and also allow R1-R4 to advertise their Loopback0 into Area 0"

 

R1:

router ospf 100

 area 20 virtual-link 192.122.3.3

 

R3:

router ospf 100

 area 20 virtual-link 192.122.3.1

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