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EXAMPLE
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The 10 non-isomorphic directed hypergraphs of order 2 are as follows (these are their arc sets): {<1,0>, <2,0>}, {<1, {2}>, <2, {1}>}, {<1, {2}>, <1,0>, <2, {1}>, <2,0>}, {<1, {2}>}, {<1, {2}>, <1,0>}, {<1, {2}>, <1,0>, <2, {1}>}, {<1,0>}, {<1, {2}>, <2,0>}, {<1, {2}>, <1,0>, <2,0>}, 0.
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