. 2017 Feb 28;16:31. doi: 10.1186/s12938-017-0322-2
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| δ(0,0) = 1 | δ(1,·) = 2 | δ(2,1–9) = 3 | δ(3,0–9) = 3 |
| δ(3,ε) = 0 | δ(0,1) = 4 | δ (4, ε) = 0 |