uses crt;
const
  n = ...;   {нужная размерность}
var
  A, B : array [1..2*n, 1..2*n] of integer;
  i, j : integer;
begin
  ...   {инициализация массива A}
  for j := 1 to n do
    for i := 1 to n do
    begin
      B[i,j] := A[i,j+n];
      B[i+n,j] := A[i,j];
      B[i,j+n] := A[i+n,j+n];
      B[i+n,j+n] := A[i+n,j];
    end;
  Writeln;
  ...  {вывод массива B}
end.

uses crt;
const
n=4;
var
a,b:array[1..2*n,1..2*n] of integer;
i,j:integer;
begin clrscr;
for i:=1 to n do
for j:=1 to n do
begin
write('a(',i,',',j,')=');
readln(a[i,j]);
end;
writeln;
writeln('Matrix a:');
writeln;
for i:=1 to n do
begin
for j:=1 to n do
write( a[i,j],'  ');
writeln;
end;
writeln;

for i:=1 to n do
for j:=1 to n do
begin
b[i,j]:=a[i,j];
end;
writeln('Matrix b:');
writeln;
for i:=1 to n do
begin
for j:=1 to n do
write( b[i,j],'  ');
writeln;
end;
readln;
end.