How much effort to put into a study assignment.A basic model

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Coczeb Head Spa Attachment for Shampoo Bowl – Hands Free Waterfall Water Circulation Equipment, Relaxing Scalp Massage Rinse for Salon & Home(Black)

Japanese Head Spa Equipment Portable Waterfall Bowl for Salon Barbershops

Head Therapy Equipment for Head SPA Shower,Spa Waterfall,Black

Professional Head Spa Equipment with Thermostatic Waterfall Circulation, 60L Water Tank, Mobile Shampoo Basin with Steam & LED Therapy for Salon Scalp Care (Black)

Freestanding Head Spa Equipment, Adjustable Water Circulation Frame

TooMiMo Head Spa Equipment Bed with Water Circulation, Japanese Head Spa Waterfall System & Steam Therapy for Salon

Head Spa Tools - Professional Shampoo Bowl Waterfall Equipment, Easy-Install Sink Faucet Hose Attachment for Hair Salon, Home & Salon