Concordance sample program, from Chapter 7
Enter text, then end-of-file:

all: 3
and: 1 2 4
borogroves: 3
brillig: 1
did: 2
gimble: 2
gyre: 2
in: 2
mimsy: 3
mome: 4
outgrabe: 4
raths: 4
slithy: 1
the: 1 2 3 4
toves: 1
twas: 1
wabe: 2
were: 3
End of concordance sample program