Draw structures corresponding to the following IUPAC names:
(a) 2,3-Dimethylhexanoic acid
(b) 4-Methylpentanoic acid
(c) trans-1,2-Cyclobutanedicarboxylic acid
(d) o-Hydroxybenzoic acid
(e) (9Z,12Z)-9,12-Octadecadienoic acid
(f) 2-Pentenenitrile