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The set of prices for the same product in all nations will vary by no more than the cost of transporting one unit of a good from the low cost nation to the high priced nation . First , in a nation built on the rule of law , allowing any set of laws , including those pertaining to immigration , to be routinely flouted undermines the very foundation of our Republic . This section facilitates easily accessing all the information relative to the Consumer Price Index ( CPI ) that measures the evolution of the set of prices of goods and services that population resident in Spanish family dwellings consumes . This is also described in Hart.1 In the resulting set of patterns , some may contain others while some may overlap others , in terms of their support sets , and a tree-graph combination could be constructed as described previously . The epitomizing example is software , the set of codes instructing computers what to do . A parallel set of issues includes the safety of the facilities and of the environment in which the educational process proceeds .