P14s Gen 1 20S4 20S5 20Y1 20Y2. P14s Gen 2 20VX 20VY 21A0 21A1. P15s Gen 1 20T4 20T5. P15s Gen 2 20W6 20W7. X1 Carbon 6th Gen 20KH 20kg. X1 Carbon 7th Gen 20QD 20QE 20R1 20R2. X1 Carbon 8th Gen 20U9 20UA.
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