s
s b@dfilename
s bad filename
s   ok_filename
l
l b@dfilename
l bad filename
l   ok_filename
a
a b@d.image
a bad image
a   _.ok._
s
s b@dfilename
s bad filename
s   ok_filename
j
j ten
j   10
j   -10
u
u ten
u 0
u -1
u    1
i
i b@d.image
i bad image
i   __..ok..__
c
c b@d
c bad search
c   a
c _.
x