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BackFor($n=1; $n>0; $abs=preg_replace($re, '/', $abs, -1, $n)) {} $re = array( '#(/\.?/)#', '#/(?!\.\.)[^/]+/\.\./#' ); for ($n = 1; top_margin = (board_height - hole_vdist) / 2; hole_vert = (board_height - hole_vdist) / 2; hole_vert = (board_height - hole_vdist) / 2 + 3 + tolerance*8; right_panel_width = width_mm - 10 LEDs - Consider: 1 simple on/off switch/button/knob/etc. PSU \+12V, -12V and ground needed, probably up to 1amp