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(Alt sticking Variant of 2, often played before 2, to build up seven rows; middle one unused row_7 = row_6 + vertical_space/7; row_7 = row_6 + vertical_space/7; row_6 = row_5 + vertical_space/7; row_3 = working_increment*2 + row_1; row_4 = row_3 + vertical_space/7; row_5 = working_increment*4 + row_1; row_4 = working_increment*3 + row_1; // special: the right-hand side tries.

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