Available four chars domains with results in the WayBack Machine

As always all of them were available at time of posting.

AOS1.COM
CEWE.ORG
FAAU.ORG
T-KJ.COM
PUXM.NET
TEYO.ORG
BYFL.NET
STM2.COM
D2FX.COM
TWWL.NET
KSZZ.NET
ZGGM.NET
0X74.NET