public Entity Log(Entity n) => Logf.Hang(this, n);
public static Entity Ln(Entity a) => Logf.Hang(e, a);
public static Entity Ln(Entity a) => Logf.Hang(a, e);
public static Entity Log(Entity @base, Entity x) => Logf.Hang(@base, x);
public static Entity Log(Entity num, Entity base_) => Logf.Hang(num, base_);