A text editor keeps the complete text in an editing buffer in memory. Size of the editing buffer is 6 lines. All lines in the editing buffer have forward links. Also, there are two linked list structures: in-use list and free-list. Lines are inserted according to their line numbers. Initial contents of the editing buffer are given. In-use 0 Free 4 In-use Free Line number 0 1 234 in 5 8123 &in 0 Text 10 LINE 1 20 LINE2 40 LINE3 50 LINE4 3 4 Show the contents of the editing buffer after the following insertion and deletion operations. Show all links. INSERT 15 XXX DELETE 40 5 Link 1 2 3 / 5