<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def remove_variable(self, v):
 """Remove variable v and all its interactions from a binary quadratic model. Args: v (variable):
 The variable to be removed from the binary quadratic model. Notes: If the specified variable is not in the binary quadratic model, this function does nothing. Examples: This example creates an Ising model and then removes one variable. False True """

        if v not in self:
            return

        adj = self.adj

        # first remove all the interactions associated with v
        while adj[v]:
            self.remove_interaction(v, next(iter(adj[v])))

        # remove the variable
        del self.linear[v]

        try:
            # invalidates counterpart
            del self._counterpart
            if self.vartype is not Vartype.BINARY and hasattr(self, '_binary'):
                del self._binary
            elif self.vartype is not Vartype.SPIN and hasattr(self, '_spin'):
                del self._spin
        except AttributeError:
            pass