public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int T = sc . nextInt ( ) ;
  for ( int i = 1 ;
  i <= T ;
  i ++ ) {
    char [ ] [ ] map = new char [ 55 ] [ 55 ] ;
    int R = sc . nextInt ( ) ;
    int C = sc . nextInt ( ) ;
    for ( int j = 1 ;
    j <= R ;
    j ++ ) {
      String line = sc . next ( ) ;
      for ( int k = 1 ;
      k <= C ;
      k ++ ) {
        map [ j ] [ k ] = line . charAt ( k - 1 ) ;
      }
    }
    boolean possible = true ;
    for ( int j = 1 ;
    j <= R ;
    j ++ ) {
      for ( int k = 1 ;
      k <= C ;
      k ++ ) {
        if ( map [ j ] [ k ] == '#' ) {
          map [ j ] [ k ] = '/' ;
          if ( map [ j ] [ k + 1 ] == '#' && map [ j + 1 ] [ k + 1 ] == '#' && map [ j + 1 ] [ k + 1 ] == '#' ) {
            map [ j ] [ k + 1 ] = '\\';map[j+1][k]=' ▁ \ ▁ \ ▁ ';map[j+1][k+1]=' ▁ / ▁ ' ;
          }
          else {
            possible = false ;
          }
        }
      }
    }
    if ( ! possible ) {
      System . out . format ( " ▁ Case ▁ ▁ ▁ # ▁ % ▁ d ▁ : ▁ \n ▁ " , i ) ;
      System . out . println ( " ▁ Impossible ▁ " ) ;
    }
    else {
      System . out . format ( " ▁ Case ▁ ▁ ▁ # ▁ % ▁ d ▁ : ▁ \n ▁ " , i ) ;
      for ( int j = 1 ;
      j <= R ;
      j ++ ) {
        for ( int k = 1 ;
        k <= C ;
        k ++ ) {
          System . out . print ( map [ j ] [ k ] ) ;
        }
        System . out . println ( ) ;
      }
    }
  }
};
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int T = sc . nextInt ( ) ; for ( int i = 1 ; i <= T ; i ++ ) { char [ ] [ ] map = new char [ 55 ] [ 55 ] ; int R = sc . nextInt ( ) ; int C = sc . nextInt ( ) ; for ( int j = 1 ; j <= R ; j ++ ) { String line = sc . next ( ) ; for ( int k = 1 ; k <= C ; k ++ ) { map [ j ] [ k ] = line . charAt ( k - 1 ) ; } } boolean possible = true ; for ( int j = 1 ; j <= R ; j ++ ) { for ( int k = 1 ; k <= C ; k ++ ) { if ( map [ j ] [ k ] == ' # ' ) { map [ j ] [ k ] = ' / ' ; if ( map [ j ] [ k + 1 ] == ' # ' && map [ j + 1 ] [ k + 1 ] == ' # ' && map [ j + 1 ] [ k + 1 ] == ' # ' ) { map [ j ] [ k + 1 ] = ' \ \' ; map [ j + 1 ] [ k ] = ' ▁ \ ▁ \ ▁ ' ; map [ j + 1 ] [ k + 1 ] = ' ▁ / ▁ ' ; } else { possible = false ; } } } } if ( ! possible ) { System . out . format ( " ▁ Case ▁ ▁ ▁ # ▁ % ▁ d ▁ : ▁ \n ▁ " , i ) ; System . out . println ( " ▁ Impossible ▁ " ) ; } else { System . out . format ( " ▁ Case ▁ ▁ ▁ # ▁ % ▁ d ▁ : ▁ \n ▁ " , i ) ; for ( int j = 1 ; j <= R ; j ++ ) { for ( int k = 1 ; k <= C ; k ++ ) { System . out . print ( map [ j ] [ k ] ) ; } System . out . println ( ) ; } } } } ; }
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