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$\phi \epsilon \left \{ A \right \} \wedge \phi \subseteq \left \{ A \right \}$

Where A is an non empty set $\left | A \right | \neq 0$
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It is possible if A is a power set of some finite set . Because

1) ϕ ϵ {A} says "Phi is an element of set A" which is possible if A contains ϕ as an element (E.g A is power set)

2) ϕ ⊆ {A} . This is a universal truth for any set A. See this . 

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