请教wordlist生成

有一批词块,可否生成它们的块首词词表(如I WAS SORT OF的块首词是I,RM I DON'T KNOW的块首词是ERM)?可以的话,用什么软件,如何操作?谢谢!

词块如下:
RM I DON'T KNOW
A GOOD FILM AND
DON'T KNOW I DON'T
GO AND SEE IT
PAINTING A PICTURE OF
HAD A LOT OF
A LOOK AT IT
A REALLY GOOD FILM
A COUPLE OF WEEKS
END OF THE DAY
LOT OF THE TIME
IN MY FIRST YEAR
IN THE FIRST PICTURE
LIKE TO GO BACK
I DON'T KNOW IT
I MEAN I I
I MEAN IT'S A
I THINK IT'S A
I HAD TO DO
I WAS LIKE OH
I WAS SORT OF
 
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