| | Linguistic variables | IFNs |
| | Extremely good (EG)/extremely high (EH) | (1.00, 0.00, 0.00) | | Very very good (VVG)/very very high (VVH) | (0.90, 0.10, 0.00) | | Very good (VG)/very high (VH) | (0.80, 0.10, 0.10) | | Good (G)/high (H) | (0.70, 0.20, 0.10) | | Medium good (MG)/medium high (MH) | (0.60, 0.30, 0.10) | | Fair (F)/Medium (M) | (0.50, 0.40, 0.10) | | Medium poor (MP)/medium low (ML) | (0.40, 0.50, 0.10) | | Poor (P)/low (L) | (0.25, 0.60, 0.15) | | Very poor (VP)/very low (VL) | (0.10, 0.75, 0.15) | | Very very poor (VVP)/very very low (VVL) | (0.10, 0.90, 0.00) |
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