Trim$ and Lset$ problem

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BigH
 #1
A$="ABCD"
aa=Len(A$)
Text 10,10,aa
LSet$(A$,19)
bb=Len(A$)
Text 10,30,bb
Trim$(A$)
cc=Len(A$)
Text 10,50,cc

Can someone please explain why I get the answers:
aa=4
bb=4
cc=4

instead of:
aa=4
bb=19
cc=4

Many thanks.