time period
formats
topics
distance-l8 - 1920
distance-l7 - 1602
distance-l6 - 1568
distance-l5 - 1440
distance-l4 - 1325
distance-l3 - 1164
distance-l2 - 1080
distance-l1 - 1024
distance-s1 - 799
distance-s2 - 720
distance-s3 - 640
distance-s4 - 414
distance-s5 - 320