Northorp Grumman RQ-4 Global Hawk USAF Production

Below is a list of RQ-4 orders for the USAF. I think there are some errors at the beginning of the list. Who can help?

Thanks!!

Ruud

RQ-4A Block 1 5
RQ-4A Block 5 2
RQ-4A Block 5 (Lot 1) 1
RQ-4A Block 10 (Lot 2) 4
RQ-4A Block 10 (Lot 3) 1
RQ-4B Block 20 (Lot 3) 3
RQ-4B Block 20 (Lot 4) 3
RQ-4B Block 30 (Lot 4) 1
RQ-4B Block 30 (Lot 5) 5
RQ-4B Block 30 (Lot 6) 5