error
In compositions "*" is intepreted as multiplication and not as a wildcard.
error
No valid ngrams to plot!
error
Ngrams not found:
(Richard I Plantagenet ('Coeur de lion') 1157 / 1189 - 99 king of England & duke of Normandy & Aquitaine)
error
The characters +, -, *, / require parentheses to be interpreted
as a composition.