bash-2.01$ time perl add_chain.pl /etc/dictionary 
at + r =
tar + t =
tart + s =
start + i =
traits + n =
transit + e =
straiten + o =
stationer + i =
iterations + c =
recitations + n =
interactions + d =
INDOCTRINATES (length 12)

real    0m6.708s
user    0m6.090s
sys     0m0.180s