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Often played before 2, to build up seven rows; middle one unused row_7 = row_6 + vertical_space/7; row_5 = working_increment*4 + row_1; row_4 = row_3 + vertical_space/7; row_5 = working_increment*4 + row_1; working_increment = working_height / (8+tolerance/3); // generally-useful spacing amount.

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