1967 - Montreal, Canada - Expo '67, (Universal and International Exhibition of 1967) the most successful Fair ever, drawing more than 50 million visitors.
... (with approximate English equivalents)
a - gut
aa - father
i - pin
ii - tweak
u - push
uu - moo
r^i = r + i
long r^i = r + ii or r + uu, depending ...