Color classification
Brown with handrail(Classy cortex])
Black without armrest(Classy cortex])
Black with armrest(Classy cortex])
Brown without handrail(Classy cortex])
Brown without armrest(Classy cortex])
Brown with armrest(Classy cortex])
Green without handrail(Classy cortex])
Green with handrail(Classy cortex])
Red without armrest(Classy cortex])
Red with armrest(Classy cortex])
Yellow without handrail(Classy cortex])
Yellow with armrest(Classy cortex])
Gray without armrest(Classy cortex])
Gray with handrail(Classy cortex])