"LCS"("R"1, "C"1) is determined by comparing the first elements in each sequence. G and A are not the same, so this LCS gets (using the "second property") the longest of the two sequences, "LCS"("R"1, "C"0) and "LCS"("R"0, "C"1). According to the table, both of these are empty, so "LCS"("R"1, "C"1) is also empty, as shown in the table below. The arrows indicate that the sequence comes from both the cell above, "LCS"("R"0, "C"1) and the cell on the left, "LCS"("R"1, "C"0).