abracadabra
abracadabr
abracadab
abracada
abracad
abraca
abrac
abra
abr
ab
a

a
ab
abr
abra
abrac
abraca
abracad
abracada
abracadab
abracadabr
abracadabra

I have seen both form of the triangle (it works better in some fonts than others)
but thea's idea is a new one--