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- 14:12, 19 October 2025 Polygon talk contribs created page 1RB2LB0LB 2LC2LA0LA 2RD1LC1RZ 1RA2LD1RD (Created page with "{{machine|1RB2LB0LB_2LC2LA0LA_2RD1LC1RZ_1RA2LD1RD}} {{TM|1RB2LB0LB_2LC2LA0LA_2RD1LC1RZ_1RA2LD1RD|halt}} is a pentational halting BB(4,3) TM. It was discovered in May 2024 by Pavel Kropitz as one of seven long running TMs and achieves a score of over <math>3 \uparrow\uparrow\uparrow 88574</math>. Polygon analysed the TM by hand in October 2025, providing its score. Pavel listed the halting tape as: <pre> 1 Z> 1^(162*3^((3*<(243*3^(6) - 5)/2; (<(54*3^((3b + 11)/2) - 2...")