:echo:
Aa:Bbb
:print:quotelist
:print:heaplist
:print:data:6
Cccc:Dddd
:print:quotelist
:print:heaplist
:print:data:16
H:I
:print:quotelist
:print:heaplist
:print:data:20
Ffffff:Gggggg
:print:quotelist
:print:heaplist
:print:data:34
:remove:2  //removes Cccc:Dddd. Not adjacent to a heap block
:print:quotelist
:print:heaplist
:print:data:34    //The Cccc:Dddd in the heap but not erased.
too:bigforthehole
:print:quotelist
:print:heaplist
:print:data:52
I:fit
:print:quotelist
:print:heaplist
:print:data:52
:remove:1  //removing Aa:Bbb cannot merge with the hole. 
:print:quotelist
:print:heaplist
:print:data:52
:remove:3  //removing I:fit should merge two blocks.
:print:quotelist
:print:heaplist
:print:data:52