X.
I shall test this.
It worked!?
It worked?!
In this problem you are to write four methods.
Is THIS a valid sentence?
That is valid!
A a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a.
Xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.
Xxxxxxx xxxxxxxxxxxxxxx Xxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.
In this problem you are to write four methods. Right!?
One. Two.
It worked!!
x.
'I shall test this.'
Some extra blanks are  here.
Some words. after the period
The sentence must end with a period, question mark, exclamation mark, or one of the two strings "!?" and "?!".