1# past problems, and suspected problems 2(A[1])|(A[2])|(A[3])|(A[4])|(A[5])|(A[6])|(A[7])|(A[8])|(A[9])|(A[A]) - A1 A1 3abcdefghijklmnop i abcdefghijklmnop abcdefghijklmnop 4abcdefghijklmnopqrstuv i abcdefghijklmnopqrstuv abcdefghijklmnopqrstuv 5(ALAK)|(ALT[AB])|(CC[123]1)|(CM[123]1)|(GAMC)|(LC[23][EO ])|(SEM[1234])|(SL[ES][12])|(SLWW)|(SLF )|(SLDT)|(VWH[12])|(WH[34][EW])|(WP1[ESN]) - CC11 CC11 6CC[13]1|a{21}[23][EO][123][Es][12]a{15}aa[34][EW]aaaaaaa[X]a - CC11 CC11 7Char \([a-z0-9_]*\)\[.* b Char xyz[k Char xyz[k xyz 8a?b - ab ab 9-\{0,1\}[0-9]*$ b -5 -5 10