Very easy, I
understood
instantly
A little hard, I
had to think about
it for a long time
Very difficult, I
could not
understand
0%
25%
50%
75%
100%
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
Very easy, I
understood
instantly
A little hard, I
had to think about
it for a long time
Very difficult, I
could not
understand
Burundi
Congo
Everyone
Grouped by country of origin