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i really need to know, i have tried to work it out but can not figure out the answer

thats from the function f
f(a)=t, f(b)=r,f(c)=s f(d)=t

remember the function F(x)=y
its the same thing as
f(a)=t, f(b)=r,f(c)=s f(d)=t

im sorry on the range it should be
Range:{r,s,t} yes or no?