Contemplation is the means whereby one can obtain this goal of understanding. Further, depth perception can be altered whereby perceived distances are incorrect. There are various mechanisms whereby animals can infect each other. This involves interactive processes whereby people find and attract potential partners and maintain a relationship. Creativity is a phenomenon whereby something new and somehow valuable is formed. Deletion is the process whereby a node is removed from the tree. Brown describes Abjection as the process whereby one group others or dehumanizes another. Vibration is a mechanical phenomenon whereby oscillations occur about an equilibrium point. Stores also contain concessions whereby other retailers may trade. BAe brokered an agreement whereby it would lead the team. Monarchy was to be a national foundation, whereby the head of the Church. This followed the introduction of a service whereby newsagents could provide some Post Office services. Zachariah placed Mary on the third step of the altar, whereby God gave her grace. The release also added features whereby developers could collaborate more easily. Britain concluded a treaty whereby Prussia agreed to protect Hanover.