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
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
