Find Larger Matches

Dear @j6k4m8,
I am looking for a way to find matches that are larger than the input motif (possibly given a certain threshold).

For instance, given the following motif:

```
motif = nx.DiGraph()
motif.add_edge("n1", "n0", label="gen")
motif.add_edge("n2", "n0", label="gen")
motif.add_node("n0", label="class")
motif.add_node("n1", label="subclass")
motif.add_node("n2", label="subclass")
```

Finding matches in a given target graph G like:

```
("n1", "n0", label="gen")
("n2", "n0", label="gen")
("n1", "n3", label="rel")
("n2", "n4", label="rel")
("n0", label="class")
("n1", label="subclass")
("n2", label="subclass")
("n3", label="class")
("n4", label="class")
```
or

```
("n1", "n0", label="gen")
("n2", "n0", label="gen")
("n1", "n3", label="rel")
("n1", "n4", label="rel")
("n1", "n5", label="rel")
("n0", label="class")
("n1", label="subclass")
("n2", label="subclass")
("n3", label="class")
("n4", label="class")
("n5", label="class")
```

etc.

It should be a kind of inexact match where the input motif is always a subset of the output matches and we can select, for instance, the number of neighbor nodes to be considered in the output matches.

Thanks in advance for your help!