f: {1,2,3,4} ---> {a,b,c,d} given by f = {<1,b>, <2,a>, <3,d>, <4,c>} g: {a,b,c,d} ---> {v,w,x,y,z} given by g = {<a,v>, <b,x>, <c,w>, <d,z>}
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$\displaystyle 1 \mapsto x$, $\displaystyle 2 \mapsto v$, $\displaystyle 3 \mapsto z$, $\displaystyle 4 \mapsto w$.
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