5 a 2 and 5 buf 16 c 8 char 1 compare 4 cond 5 count 1 d 1 die 3 else 1 entry 1 eof 4 err 1 error 1 exit 1 folded 1 for 1 free 1 frequencies 1 frequency 1 get 2 getchar 3 getword 14 if 2 in 1 index 1 input 1 install 8 int 1 into 1 is 4 isletter 1 it 1 itself 5 left 1 letter 7 lookup 1 main 2 malloc 1 message 2 n 1 necessary 12 next 9 node 4 of 1 on 1 or 1 otherwise 2 out 8 p 3 print 2 printf 16 return 5 right 4 root 25 s 2 storage 3 strcmp 1 strcpy 1 strlen 8 struct 1 structures 2 subtree 1 t 5 tprint 9 tree 1 uses 1 version 1 wf 3 while 21 word 9 words 2 z