list fig activ creat standard activ list fig messag fig messag list fig activ activ link list fig activ check incom action creat activ lifelin fig activ current activ incom action fig messag current activ creat activ fig owner line fig line fig line fig width line fig height set count number repeat return place activ shouldn requir handl stack activ better issu sort activ count fig messag fig messag fig messag sender fig messag self messag incom fig messag current activ fig messag action dest action creat activ don add height set sender fig messag current activ creat activ fig owner line fig sender set fig messag activ count fig messag creat action destin creat action creat entir activ current activ creat activ fig owner line fig line fig set fig messag activ count fig messag action classifi role current activ activ messag fig messag activ count fig messag destroi action target destroi action figlifelin end add activ sender fig messag current activ set height sender current activ current activ set destroi line fig set height sender activ add current activ current activ outgo fig messag current activ current activ activ end fig messag activ count sourc action activ end sender fig messag start current activ set height sender current activ activ add current activ current activ current act object mean reach end lifelin creat return add activ list set height end end lifelin current activ current activ set height height current activ activ add current activ activ 