diff --git a/Sheet7/Ex_9to13/accu_template/square_2.txt b/Sheet7/Ex_9to13/accu_template/square_2.txt
new file mode 100644
index 0000000..a3fc987
--- /dev/null
+++ b/Sheet7/Ex_9to13/accu_template/square_2.txt
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diff --git a/Sheet7/Ex_9to13/accu_template/square_4.m b/Sheet7/Ex_9to13/accu_template/square_4.m
new file mode 100644
index 0000000..536bbb1
--- /dev/null
+++ b/Sheet7/Ex_9to13/accu_template/square_4.m
@@ -0,0 +1,71 @@
+% Square: 
+%   flatpak run org.octave.Octave <filename>
+%      or
+%   octave --no-window-system --no-gui  -qf <filename>
+
+clear all
+clc
+% %% L-shape
+% g=[2 0 2 0 0 1 0;        % #vertices,v_1x, v_2x, v_1y, v_2y, subdomain_left, subdomain_right
+%    2 2 2 0 1 1 0;
+%    2 2 1 1 0.5 1 0;
+%    2 1 1 0.5 2 1 0;
+%    2 1 0 2 2 1 0;
+%    2 0 0 2 0 1 0]';
+
+%% square
+% g=[2 0 1 0 0 1 0;        % #vertices,v_1x, v_2x, v_1y, v_2y, subdomain_left, subdomain_right
+%    2 1 1 0 1 1 0;
+%    2 1 0 1 1 1 0;
+%    2 0 0 1 0 1 0]';
+
+% %% 2 squares
+% g=[2 0 1 0 0 1 0;        % 1 #vertices,v_1x, v_2x, v_1y, v_2y, subdomain_left, subdomain_right
+%    2 1 1 0 1 1 2;
+%    2 1 0 1 1 1 0;
+%    2 0 0 1 0 1 0;
+%    2 1 2 0 0 2 0;        % 2 #vertices,v_1x, v_2x, v_1y, v_2y, subdomain_left, subdomain_right
+%    2 2 2 0 1 2 0;
+%    2 2 1 1 1 2 0
+%    ]';
+
+%% 4 squares
+g=[2 0 1 0 0 1 0;        % 1 #vertices,v_1x, v_2x, v_1y, v_2y, subdomain_left, subdomain_right
+   2 1 1 0 1 1 2;
+   2 1 0 1 1 1 3;
+   2 0 0 1 0 1 0;
+   2 1 2 0 0 2 0;        % 2 #vertices,v_1x, v_2x, v_1y, v_2y, subdomain_left, subdomain_right
+   2 2 2 0 1 2 0;
+   2 2 1 1 1 2 4;
+%    2 1 1 1 0 2 1;
+%    2 0 1 1 1 3 1;        % 3 #vertices,v_1x, v_2x, v_1y, v_2y, subdomain_left, subdomain_right
+   2 1 1 1 2 3 4;
+   2 1 0 2 2 3 0;
+   2 0 0 2 1 3 0;
+%    2 1 2 1 1 4 2;        % 4 #vertices,v_1x, v_2x, v_1y, v_2y, subdomain_left, subdomain_right
+   2 2 2 1 2 4 0;
+   2 2 1 2 2 4 0
+%    2 1 1 2 1 4 3
+   ]';
+
+[p,e,t] = initmesh(g,'hmax',0.1); 
+pdemesh(p,e,t)
+
+%% GH
+% output from <https://de.mathworks.com/help/pde/ug/initmesh.html initmesh>
+%
+% coordinates  p: [2][nnode]
+% connectivity t: [4][nelem]   with  t(4,:) are the subdomain numbers
+% edges        e: [7][nedges]  boundary edges
+%                              e([1,2],:) - start/end vertex of edge
+%                              e([3,4],:) - start/end values
+%                              e(5,:)     - segment number
+%                              e([6,7],:) - left/right subdomain
+
+ascii_write_mesh( p, t, e, mfilename);
+
+ascii_write_subdomains( p, t, e, mfilename);
+
+
+% tmp=t(1:3,:)
+
diff --git a/Sheet7/Ex_9to13/accu_template/square_4.pdf b/Sheet7/Ex_9to13/accu_template/square_4.pdf
new file mode 100644
index 0000000..8fca9e3
Binary files /dev/null and b/Sheet7/Ex_9to13/accu_template/square_4.pdf differ
diff --git a/Sheet7/Ex_9to13/accu_template/square_4.txt b/Sheet7/Ex_9to13/accu_template/square_4.txt
new file mode 100644
index 0000000..34f08fd
--- /dev/null
+++ b/Sheet7/Ex_9to13/accu_template/square_4.txt
@@ -0,0 +1,2176 @@
+708
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diff --git a/Sheet7/Ex_9to13/accu_template/square_4_sd.txt b/Sheet7/Ex_9to13/accu_template/square_4_sd.txt
new file mode 100644
index 0000000..3ac508a
--- /dev/null
+++ b/Sheet7/Ex_9to13/accu_template/square_4_sd.txt
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