For example, there can be a greater discrepancy in the birth weights of MZ twins relative to DZ twins due to the foetofoetal transfusion syndrome, and certain perinatal complications are more likely to occur in MZ than DZ twins.

The veriest atomy he looked, With grimy fingers clutching and crooked, Tight skin, a nose all bony and hooked, And a shaking, sharp, suspicious way;

The Crown argued that the accused had rehearsed her story.

A differential operator P(D) is hypoelliptic if for any domain ⊂ ℝⁿ any solution u of the equation P(D)u=0 from the class 𝔇'(𝛺) is a function from C ᪲(ω) for any open set ω ⊂⊂ 𝛺. A complete algebraic description of all hypoelliptic differential operators has been obtained by Hörmander in [H1].