text 851 1698 1506 1994
equation 189 867 803 972
text 151 984 806 1994
text 851 191 1506 1190
text 851 1335 1506 1566
text 151 184 804 856
equation 891 1210 1503 1314
equation 994 1586 1503 1678
header 260 130 1400 158