10 UMLClass 200 140 190 100 STUDENT -- snumber ID first-name last-name degree bg=#dddddd UMLClass 640 150 190 80 BOOK -- library ID call-number ID title bg=#dddddd UMLClass 440 190 160 30 when-borrowed bg=#dddddd Relation 380 170 280 50 lt=- m1=* r1= m2=* Borrows > 10.0;20.0;260.0;20.0 UMLClass 420 300 200 50 BORROWING -- when-returned[0..1] bg=#dddddd Relation 510 210 30 110 lt=. 10.0;90.0;10.0;10.0