{ var a := @integer {2 of 1, 2 of 2}; var b := @@integer {2 of a}; write ("b[0][0] is ", b[0][0]); write ("b[0][1] is ", b[0][1]); write ("b[1][0] is ", b[1][0]); write ("b[1][3] is ", b[1][3]); b[2][0] := 10 }