'sal-cod1.dat: refracted and reflected P-waves'
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5   1 1 1 1 1 1 1 1 1 1         / refracted
1   1 2 2 5 2 2 1 1             / reflected from top of salt
2   1 2 3 3 2 1                 / reflected from top of salt 
1   1 2 2 5 5 6 5 5 2 2 1 1     / reflected from bottom of salt
1   1 2 2 5 5 6 5 5 3 3 2 2 1 1 / reflected from bottom of salt
2   1 2 5 3 3 5 2 1             / reflected from bottom
2   1 2 5 3 3 5 3 2 1           / reflected from bottom
2   1 2 5 3 3 2 1               / reflected from bottom
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Tested codes with no two-point rays satisfying the whole code
2   1 2 3 5 5 3 2 1             / reflected from bottom of salt - no rays
2   1 2 3 5 5 2 1               / reflected from bottom of salt - no rays
1   1 2 2 3 3 5 5 6 5 5 2 2 1 1 / reflected from bottom of salt - no rays