I need help with this problem please, and please make it legible I often can't read it.

a b C d 5. Consider the function f: defined on positive integers with f(n) = n "flipped" as a mirror image into a decimal. For example, f(5) = .5, f(418) = .814, and f(1000) = .0001. Define a relation R on the positive integers as (m, n) E R if and only if f(m) s f(n). For example, (5, 418) E R because .5 s .814 but (418, .923) .329. Is R a partial order? Either provide a proof to show that this is true or provide a counterexample to show that this is false