Table schema:
CREATE TABLE table_name_90 (rank INTEGER, location VARCHAR, current_seating_capacity VARCHAR)

Question: What is the highest Rank, when Location is Kinshasa, DR Congo, and when Current Seating Capacity is less than 80,000?
SQL: SELECT MAX(rank) FROM table_name_90 WHERE location = "kinshasa, dr congo" AND current_seating_capacity < 80 OFFSET 000