diff --git a/Sheet7/Ex_9to13/accu_template/square_1.m b/Sheet7/Ex_9to13/accu_template/square_1.m
new file mode 100644
index 0000000..ca4f171
--- /dev/null
+++ b/Sheet7/Ex_9to13/accu_template/square_1.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_1.txt b/Sheet7/Ex_9to13/accu_template/square_1.txt
new file mode 100644
index 0000000..4262ebf
--- /dev/null
+++ b/Sheet7/Ex_9to13/accu_template/square_1.txt
@@ -0,0 +1,558 @@
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diff --git a/Sheet7/Ex_9to13/accu_template/square_1_sd.txt b/Sheet7/Ex_9to13/accu_template/square_1_sd.txt
new file mode 100644
index 0000000..0d50803
--- /dev/null
+++ b/Sheet7/Ex_9to13/accu_template/square_1_sd.txt
@@ -0,0 +1,329 @@
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diff --git a/Sheet7/Ex_9to13/accu_template/square_2.m b/Sheet7/Ex_9to13/accu_template/square_2.m
new file mode 100644
index 0000000..ee6c3bc
--- /dev/null
+++ b/Sheet7/Ex_9to13/accu_template/square_2.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_2_sd.txt b/Sheet7/Ex_9to13/accu_template/square_2_sd.txt
new file mode 100644
index 0000000..4face4e
--- /dev/null
+++ b/Sheet7/Ex_9to13/accu_template/square_2_sd.txt
@@ -0,0 +1,653 @@
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