four alpha numeric lines separated by CR 6m -- 19Qs - 11 grids2m -- 38Qs - 17 grids222 - 15Qs - 9 grids432 - 21Qs - 10 grids four alpha numeric lines separated by 2-CRs 6m -- 19Qs - 11 grids 2m -- 38Qs - 17 grids 222 - 15Qs - 9 grids 432 - 21Qs - 10 grids