A PhD's Idea

graph TD;
    s1(An Idea)-->d1{Did the PhD find this idea in the literature?};
	d1{Did the PhD find this idea in the literature?}-->|Yes|b1(Fail);
	d1{Did the PhD find this idea in the literature?}-->|No|b2[Weeks of work];
	b2[Weeks of work]-->b1(Fail);