The following lines contain the word 'select', 'insert', 'update' or 'delete':
select decode(upper(l_filtered_number),'A','2','B','2','C','2',
'D','3','E','3','F','3',
'G','4','H','4','I','4',
'J','5','K','5','L','5',
'M','6','N','6','O','6',
'P','7','Q','7','R','7','S','7',
'T','8','U','8','V','8',
'W','9','X','9','Y','9','Z','9',l_filtered_number) into l_filtered_number from dual;