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waves 2

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Absolute running time: 0.2 sec, cpu time: 0.47 sec, memory peak: 30 Mb, absolute service time: 0,21 sec 
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Error(s), warning(s):
Warning message:
In matrix(c(0, 0, 0, 1, 2, 1, 0, 0, 0, 0, 0, 0, 1, 2, 1, 0, 0, 0,  :
  data length [27] is not a sub-multiple or multiple of the number of rows [4]

[1] "Hello, world!"
     [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9]
[1,]    0    0    0    1    2    1    0    0    0
[2,]    0    0    0    1    2    1    0    0    0
[3,]    0    0    0    0    0    0    0    0    0
[4,]    0    0    0    1    2    1    0    0    0
[1] 0
     [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9]
[1,]    0    0    0    1    2    1    0    0    0
[2,]    0    0    0    1    2    1    0    0    0
[3,]    0    0    2    1   -2    1    2    0    0
[4,]    0    4   -2   -3    6   -3   -2    4    0