Instruction: Evaluate each product title in the given list, assess its relevance to the given query, and then arrange the products in descending order of relevance, with the most relevant product at the top of the ranked list.

Input:
Query: freon recovery machine
Product list:
A: Elitech LMC-100F Refrigerant Charging Weight Scale High Precision for HVAC with Case 110Lbs
B: Robinair (34102) Refrigerant Tank for R-134a, refrigerant not included - 30 lbs. , Light Blue
C: Kozyvacu 1HP Oilless Portable Refrigerant Recovery Machine for Both Liquid and Vapor Refrigerant
D: FAVORCOOL 3.0CFM 1/4HP Air Vacuum Pump with Manifold Gauge Set for Freon Charging,fits R410A, R134A, R22 Refrigerants, for HVAC Car Truck A/C AC Refrigerant Charge Kit, Quick Couplers
Answer: D,C,B,A