Text: After King Birendra became sovereign in 1972 tenth in the line of Shah rulers since King Prithvi the Great a referendum in which all Nepalis over 21 were eligible to vote confirmed the popular preference for the panchayat system over a return to multi-party democracy.
Entailment: All Nepalis over 21 were eligible to vote because King Prithvi the Great had a referendum.
Contradiction: The sovereignty became known in that country in the 21th century.