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+ h_margin/2, row_1, 0]; square_out = [third_col, fourth_row, 0]; //Fifth row interface placement pwm_in = [first_col, fifth_row, 0]; square_out = [output_column, bottom_row, 0]; pwm_pot = [input_column - h_margin/2, bottom_row, 0]; fm_in = [h_margin+working_width/8.