10
1 . . . . . . . . . 
2 1 . . . . . . . 4 
3 2 1 . . . . . 4 . 
. 3 2 1 . . . 4 . . 
. . 3 2 1 . 4 . . . 
. . . 3 2 1 . . . . 
. . . . 3 2 1 . . . 
. . . 4 . 3 2 1 . . 
. . 4 . . . 3 2 1 . 
. 4 . . . . . 3 2 1
# 
# Problem from http://www.cs.cornell.edu/gomes/QUASIdemo.html
# (n = 10)
# Pattern #4. 
#  dark red   = 1
#  light blue = 2
#  dark blue  = 3
#  light red  = 4
# Note: There are no solutions to this problem.
# 
#
# Copyright 2010 Hakan Kjellerstrand hakank@bonetmail.com
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.