(12) Which of the following are numbered among Cimrman’s accomplishments?
a) He presented to the American government a proposal to build the Panama Canal.

b) He reformed the Czech educational system.

c) He built a blimp using sturdy Swedish steel, equipping it with a Czech gondola.

d) He contributed to watch-making.

e) He was the editor of the third edition of Komenský's Orbis pictus.