In the 4th season of Hidamari Sketch, Honeycomb, there's scenes where there's a bunch of numbers (and an HK with a "honeycomb" symbol) in the background. Do these numbers have any significance? Are they related to production cuts (sometimes shown in "flash card" style during Bakemonogatari, another Studio Shaft production)?
Examples:
Episode 1:
Bottom right corner: HK 01105
Episode 5:
Bottom right corner: HK 05274
Episode 6:
Bottom right corner: HK 06333
Episode 10:
Bottom right corner: HK 10133
Episode 12:
Bottom right corner: HK 12074
Not sure if I missed any, but it looks like a 2 digit episode number and 3 digits of something else. Also, not sure if previous seasons of Hidamari Sketch has these, been a while since I've seen them. What do the other strings of numbers, that don't seem to change, mean?