まんまん
very much; fully
I know it very well.
・ten thousand
・10,000
まんまんいち
(if) by some very rare chance;in the very unlikely event that ...
まんまんねん
tens of thousands of years;eternity
ばんばんざい
matter for great congratulation
never
ばんばん
very much;fully
ばんばんいつ