Blink All of 5x5 micro:bit LED

int Row1[] ={26,27,26,27,26};
int Row2[] ={28,28,28,28,28};
int Row3[] ={27,26,27,28,27};
int Row4[] ={26,26,26,26,26};
int Row5[] ={28,27,28,27,28};
int Row[] = {26,27,28};
int Col[] = {3,4,6,7,9,10,23,24,25};
int Col1[] ={3,23,4,24,10};
int Col2[] ={23,24,25,9,7};
int Col3[] ={4,6,10,6,3};
int Col4[] ={7,9,25,24,23};
int Col5[] ={10,9,3,25,4};
int i,j;
void setup() {
  for(i=0;i<3;i++){pinMode(Row[i], OUTPUT);}
  for(i=0;i<9;i++){pinMode(Col[i], OUTPUT);}
  for(int i=0;i<3;i++){digitalWrite(Row[i],HIGH); }
}
void loop(){
  for(int i=0;i<5;i++){digitalWrite(Col1[i],LOW); }
  for(int i=0;i<5;i++){digitalWrite(Col2[i],LOW); }
  for(int i=0;i<5;i++){digitalWrite(Col3[i],LOW); }
  for(int i=0;i<5;i++){digitalWrite(Col4[i],LOW); }
  for(int i=0;i<5;i++){digitalWrite(Col5[i],LOW); }delay(300);
  for(int i=0;i<5;i++){digitalWrite(Col1[i],HIGH); }
  for(int i=0;i<5;i++){digitalWrite(Col2[i],HIGH); }
  for(int i=0;i<5;i++){digitalWrite(Col3[i],HIGH); }
  for(int i=0;i<5;i++){digitalWrite(Col4[i],HIGH); }
  for(int i=0;i<5;i++){digitalWrite(Col5[i],HIGH); }delay(300);
  }