Partnership of a knife and fork;

Useful when you are lunchin' ;

Both, complementing the other;

Each, a specific function.

Using a knife in place of a fork,

Would potentially, be doomin' ;

Another pair, different but equal:

MAN AND WOMAN.

Footnote:

Gender bias continues to be an issue in my home country (Zambia) and globally, especially in developing nations.

I applaud all the women and men, who are contributing their time and resources towards the advocation of gender equality.

(August 26th: Women's Equality Day, USA)