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PHP solution by DennisdeBest

Optimizations by xeridea: No longer uses class methods for basic operations. Leaned the loop logic. Uses factor * factor. Enabled JIT, small improvement in docker, native it gives me about 30% boost.

Optimisations by sqonk: Changing SPLFixedArray to a simple string yields a nearly 2x performance increase.

Algorithm Faithfulness Parallelism Bit count