difficulty:
E easy
H hard
I impractical to impossible
V very ...
IMT MT Icon
simple evaluation E VE
generation H E
looping control structures E I
generative control structures H H
string scanning H H
co-expression activation VH E
assignment E E
structure access H E
structure contents H E
type usage VH E
type conversion VH E
storage management I E
execution locus H VE