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The sieve keeps the coarse stones from entering the cradle , the current of water washes off the earthly matter , and the gravel is gradually carried out at the foot of the machine , leaving the gold mixed with a heavy fine black sand above the first cleets . This is a complicated matter with a long history , but I want to make it clear that this amendment keeps the door open for the States that have obtained a court decision in their favor . For example , since agent migration keeps the whole contexts of a process including multiple threads , concurrent states of their execution does not have any impact . The civilian context keeps the population in poor and precarious conditions of live , where their access to essential relief and services is limited . The proposed platform not only provides all of these functions , but also permits them to be combined in a system , in which agent migration keeps the network-transparency of distributed object completely . If she has a broad face and square brow , well-marked eyebrows and curly dark hair , a certain expression of amusement in her glance which her mouth keeps the secret of , and for the rest features entirely insignificant - take that ordinary but not disagreeable person for a portrait of Mary Garth .