it worked only after 144532 attempts,
mask was: 
[
 [
  [0 0 0 0 1 0 0]
  [0 0 0 0 1 0 0]
  [0 0 0 0 1 0 0]
  [0 0 0 0 0 0 0]
  [1 1 1 0 1 1 1]
  [0 0 0 0 1 0 0]
  [0 0 0 0 1 0 0]
 ]
 [
  [0 0 0 0 1 0 0]
  [0 0 0 0 1 0 0]
  [0 0 0 0 1 0 0]
  [0 0 0 0 0 0 0]
  [1 1 1 0 1 1 1]
  [0 0 0 0 1 0 0]
  [0 0 0 0 1 0 0]
 ]
 [
  [0 0 0 0 1 0 0]
  [0 0 0 0 1 0 0]
  [0 0 0 0 1 0 0]
  [0 0 0 0 0 0 0]
  [1 1 1 0 1 1 1]
  [0 0 0 0 1 0 0]
  [0 0 0 0 1 0 0]
 ]
]
good matrix was: 
[
 [
  [0.4 0.3 0.3 0.9 0.6 0.3 0.2]
  [0.8 0.8 0.2 0.8 0.6 0.9 0.2]
  [0.9 0.0 1.0 0.3 0.8 1.0 0.3]
  [0.5 0.3 0.8 0.5 0.3 0.6 1.0]
  [0.8 0.7 0.3 0.4 0.3 0.2 0.4]
  [1.0 0.4 0.8 0.9 0.4 0.2 0.9]
  [0.0 0.8 0.7 0.9 0.0 0.1 0.7]
 ]
 [
  [0.1 0.8 0.5 1.0 0.5 0.1 0.8]
  [0.0 0.4 0.7 0.1 0.3 0.1 0.5]
  [0.6 0.0 0.4 0.7 0.5 0.1 0.5]
  [0.7 0.2 0.1 0.1 0.3 0.2 0.5]
  [0.6 0.5 0.2 0.5 0.5 1.0 0.6]
  [0.9 0.2 0.5 0.6 0.5 0.0 0.2]
  [0.9 0.9 0.2 0.6 0.2 0.1 0.2]
 ]
 [
  [0.8 0.3 0.9 0.5 0.5 0.3 0.2]
  [0.2 0.5 0.5 0.3 0.8 0.0 0.3]
  [0.3 1.0 0.3 0.8 0.3 0.8 0.8]
  [0.7 0.9 0.7 0.1 0.6 0.9 0.7]
  [0.4 0.3 0.8 0.7 0.5 0.8 0.3]
  [0.8 0.9 0.5 0.2 0.1 0.4 0.2]
  [0.4 0.7 0.5 0.2 0.7 0.1 0.3]
 ]
]
and it was not very different from: 
[
 [
  [0.5 0.2 1.0 0.4 0.9 0.2 0.4]
  [0.7 0.2 0.1 0.6 0.6 0.2 0.4]
  [0.8 0.3 0.6 0.7 0.4 0.3 0.9]
  [0.7 0.1 0.5 0.3 0.5 0.7 0.2]
  [0.5 0.6 0.7 1.0 0.4 0.1 0.5]
  [0.4 0.8 1.0 0.6 0.4 0.3 0.7]
  [0.8 1.0 0.7 0.6 0.3 0.7 0.8]
 ]
 [
  [0.4 0.6 0.1 0.2 0.1 0.2 0.7]
  [0.7 0.9 0.1 0.2 0.7 0.7 0.2]
  [0.9 0.6 0.0 1.0 0.6 0.7 0.8]
  [0.3 1.0 0.3 0.4 0.5 0.3 0.3]
  [0.8 0.7 0.3 0.1 0.3 0.7 0.5]
  [0.2 0.4 0.5 0.2 0.3 0.3 0.9]
  [0.9 0.7 0.4 0.1 0.2 0.9 0.8]
 ]
 [
  [0.1 0.0 0.7 0.3 0.8 0.2 0.1]
  [0.4 0.4 0.4 0.3 0.8 0.7 0.1]
  [0.3 0.3 0.0 0.0 0.1 0.2 1.0]
  [0.8 0.1 0.7 0.7 0.4 0.3 0.3]
  [0.7 0.1 0.9 0.6 0.4 0.9 0.3]
  [0.1 0.2 0.4 0.4 0.5 0.6 0.3]
  [0.6 0.5 0.5 0.9 0.7 0.5 0.6]
 ]
]