P → 1; Q → 2; R → 5; S → 3

P → 5; Q → 4; R → 2; S → 3

P → 3; Q → 2; R → 1; S → 4

P → 1; Q → 3; R → 5; S → 4

P $\rightarrow$ 2; Q $\rightarrow$ 4; R $\rightarrow$ 1; S $\rightarrow$ 3

P $\rightarrow$ 3; Q $\rightarrow$ 4; R $\rightarrow$ 5; S $\rightarrow$ 2

P $\rightarrow$ 2; Q $\rightarrow$ 1; R $\rightarrow$ 5; S $\rightarrow$ 3

P $\rightarrow$ 3; Q $\rightarrow$ 5; R $\rightarrow$ 4; S $\rightarrow$ 2

P $\rightarrow$ 2; Q $\rightarrow$ 1; R $\rightarrow$ 5; S $\rightarrow$ 4

P $\rightarrow$ 1; Q $\rightarrow$ 2; R $\rightarrow$ 4; S $\rightarrow$ 5

P $\rightarrow$ 1; Q $\rightarrow$ 2; R $\rightarrow$ 3; S $\rightarrow$ 4

P $\rightarrow$ 2; Q $\rightarrow$ 1; R $\rightarrow$ 3; S $\rightarrow$ 5

The derivative of the function $f$ is decreasing in the interval $(0, 1)$

The function $f$ has a local maximum at some point $a \in (0, \infty)$

The function $f$ has a local minimum at some point $b \in (0, \infty)$

The function $f$ has NEITHER a point of local maximum NOR a point of local minimum in the interval $(0, \infty)$