typedef struct{
  uint8_t x, y;
  union {
    struct {
      uint8_t t00 : 2;
      uint8_t t10 : 2;
      uint8_t t01 : 2;
      uint8_t t11 : 2;
      uint8_t t02 : 2;
      uint8_t t12 : 2;
    };
    uint16_t tAll;  
  };
} TTile;