To help solve the problem and find the sides $DE$, $OE$, $CF$, $OC$, and $OB$ from the image you've uploaded, I need to analyze the diagram and the given relationships carefully.

I'll take a closer look at the image and extract the relevant geometric properties from the diagram to find these sides.

Please give me a moment to process it.I have opened the image, and from the diagram, I can see a combination of a circle with several segments and points labeled as $D, E, F, O, B,$ and $C$. The problem seems to be related to geometry, involving lengths of specific segments, tangents, and possibly relationships such as the Pythagorean theorem.

Could you provide more context regarding any known values or specific geometric relationships? For instance, are any angles or segment lengths given? This information would help me assist you more effectively in calculating the lengths of the sides $DE$, $OE$, $CF$, $OC$, and $OB$.