() (B,A)
(A,B) (C:A;D,D:B)
(A,B) (C:E)
(A,B) (C:A;B;E,D:F)
(A,B) (C:A;B;D;E;F,E:A,D:F)
(A,B,C,D,E) (F)
(Pack1, Pack2)   (  Pack3 : Pack4 , Pack4 : Pack1  )
() (ThisIsAVeryLongPackageNameThat:MadeUpPackage)
(UPPER,lower) (NEW:uPpEr;LOWER,oThEr:new)