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

He fell down over and over, and each time he felt like he was at the beginning. Leo read articles online that were written by __________________ snowboarders to learn the moves. Most of all, he wanted to do a flip.