Об­ра­зуй­те от слова PARTNER од­но­ко­рен­ное слово так, чтобы оно грам­ма­ти­че­ски и лек­си­че­ски со­от­вет­ство­ва­ло со­дер­жа­нию тек­ста.

The State Hermitage Museum in St. Petersburg is one of the most well-⁠known art museums both in Russia and around the world. But it is not only its exhibits that it is known for. For the longest time in its history the museum has had a productive __________________ with a much loved animal: the cat.