# Desk
# X_X_X_X_X_X
# _X_X_X_X_X_X
# X_X_X_X_X_X_
# _X_X_X_X_X_X
# X_X_X_X_X_X_
# _X_X_X_X_X_X
# X_X_X_X_X_X_
#  X_X_X_X_X_X

# Has 4*8 black squares and 4*8 - 2 white sqaures
# One domino can cover on;y black and white squares simultaneously
# So at least 2 black squares can't be covered
