Put Option Chain Bid Question

An easy question for someone here...I was looking at the USO option chain yesterday with USO at 24. The bid for June 5 puts was something like this below.

Why would that 4 strike price have an .01 bid when the ones above it are all 0? Is that just someone trying to close out their position?

(I thought about selling some cash-secured puts to pick up the low risk dollar since USO is at 24).

4......... .01
5.........0.00
6.........0.00
8.........0.00
9.........0.00
8.........0.00
10....... .02
11....... .02
etc.
 
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