Table 1: Linguistic variable and its scale.

Scale12345678
Variables235567911

None-N, NY
Very low, VLYYYYY
Low-very low, V-VLY
Low, LYYYYYYYY
Fairy low, FLYYYY
Mol low, MLYY
Medium, MYYYYYY
Mol high, MHYY
Fairy high, FHYYY
High, HYYYYYYYY
High-very high, H-VHY
Very high, VHYYYYY
Excellent, EY