A working version of the "finger trap". But one thing confuses me. It is necessary to use a very large margin so that m0.4 and m09 coincide. Because of this, the calculation speed decreases.

But the m09 is much faster than the m0.4.
The screenshot shows m0.4 and m09 with a period of 2. And a multiplier of 0 (Bs[i2]*Bs[i2]* 0 ). If multiplied by 3, the lines will match.