app
app
map
f
nil
nil
app
app
map
f
app
app
cons
x
xs
app
app
cons
app
f
x
app
app
map
f
xs
app
sum
app
app
cons
x
xs
app
app
plus
x
app
sum
xs
app
size
app
app
node
x
xs
app
s
app
sum
app
app
map
size
xs
app
app
plus
0
x
0
app
app
plus
app
s
x
y
app
s
app
app
plus
x
y
app
2
map
0
nil
0
cons
0
sum
0
plus
0
size
0
node
0
s
0
0
0
FULL