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

In 1928 it was invented by Walter E. Diemer who worked for the Fleer Chewing Gum Company in Philadelphia. In his spare time Diemer was trying new gum recipes and, by accident, invented a ______ gum.