( /INPROZ/ISLER_A/princ.txt )
. - 1 8 10 11 12 x x x 13 14 15 16 17 x x x 18 20 x x x 21 x x x x x x x x x 24 25 x x x 26 27 30 x x x 31 32 28 29 x x x x x x 34 x x x x x x 35 x x x x x x