Similar to a blood or barrel shaped knot with inward coils(bkic). The bkic is strong, secure and relatively easy to untie. Just add a couple more inward coils and finish by tucking the working end between the green and blue lines but from opposite directions.
Simple Simon Under double is what I like. It's simple, secure, strong and easier to untie. Plus you can tie together line of different sizes and texture.
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