Here is an example with three firms and four workers.
| $\cred\ff$ | ||||
| $\cred x$ | $\cred y$ | $\cred z$ | ||
| $\cred a$ | $1$ | $8$ | $3$ | |
| $\cred\ll$ | $\cred b$ | $3$ | $1$ | $8$ |
| $\cred c$ | $8$ | $3$ | $1$ | |
| $\cred d$ | $7$ | $7$ | $7$ |
The optimal match is $\tiny a\lra y,\quad b\lra z,\quad c\lra x$.