Bertangles
1
2
3
4
5
6
7
8
9
10
11
12
a
a
b
b
c
c
d
d
e
e
f
f
g
g
h
H
h
i
A
i
k
L
k
l
l
m
m
n
n
o
o
p
p
q
q
r
r
1
2
3
4
5
6
7
8
9
10
11
12