Задан массив М[i, j] i, j = 1,10, найти сумму элементов предпоследнего столбца — Pascal(Паскаль)

uses crt;
var a:array[1..10,1..10] of integer;
i,j,s,n:integer;
 
procedure add;
begin
s:=0;
for i:=1 to n do
begin
s:=s+a[i,j-1];
end;
writeln('Summa = ',s);
end;
 
begin
clrscr;
randomize;
write('n = ');
readln(n);
for i:=1 to n do
for j:=1 to n do
begin
a[i,j]:=random(100);
end;
writeln;
for i:=1 to n do
begin
for j:=1 to n do
begin
write(a[i,j]:3);
end;
writeln;
end;
add;
readln;
end.

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+ 49 = 50