For a one-one relation can be established between the members of a and a by the simple process of correlating each member of a with itself.
One end of the body, through contact, during locomotion, with fresh tracts of medium and other forms of stimuli, has become more specialized than the rest, and here the nervous system and sense-organs are more densely aggregated than elsewhere, forming a means of controlling locomotion and of correlating the activities of the inner organs with the varying stimuli that impinge upon the body.
In subdividing the strata of the Carboniferous system and correlating the major divisions in different areas, just as in other great systems, use has to be made of the fossil contents of the rocks; stratigraphical units, based on lithology, are useless for this purpose.
Some state hotlines will ask you for the name of your school, which can help them find the correlating assignment or curriculum.
On a simplistic level, the use of the Chinese five elements in feng shui requires that you look at the year you were born, correlating that to the element that relates to that year.