Typo in Oblig 4

Unfortunately there was a typo in 2a) in oblig 4: 

The expression (xij, yij) = g(i * Uj/19) holds for i=0, 1, ¡­, 19. (not for j=0,...,19 since j relates to the curve-numbers 1,2 , ¡­ 9).

The assignment text is now corrected.