STORE 'abcdefghijklm' TO gcString1
STORE '12345' TO gcString2
CLEAR
? STUFF(gcString1, 4, 0, gcString2) && insert
? STUFF(gcString1, 4, 3, gcString2) && replace
? STUFF(gcString1, 4, 6, '') && delete
? STUFF(gcString1, 4, 1, gcString2) && replace and insert
? STUFF(gcString1, 4, 4, gcString2) && replace and delete
? STUFF(gcString1, 4, LEN(gcString1), gcString2) && replace, delete rest