# Path: penman/types.py



from typing import Dict, List, Tuple, Set, Mapping, Any, Iterator
from penman.types import (Variable, Branch, Node)
        """
        Recreate node variables formatted using *fmt*.

        The *fmt* string can be formatted with the following values:

        - ``prefix``: first alphabetic character in the node's concept
        - ``i``: 0-based index of the current occurrence of the prefix
        - ``j``: 1-based index starting from the second occurrence
        """
        varmap: Dict[Variable, Variable] = {}
        used: Set[Variable] = set()
        for var, branches in self.nodes():
            if var not in varmap:
                concept = next((tgt for role, tgt in branches if role == '/'),
                               None)
                pre = _default_variable_prefix(concept)
                i = 0
                newvar = None
                while newvar is None or newvar in used:
                    newvar = fmt.format(
                        prefix=pre,
                        i=i,
                        j='' if i == 0 else i + 1)
                    i += 1
                used.add(newvar)
                varmap[var] = newvar

        self.node = _map_vars(self.node, varmap)



# Path: penman/types.py



# Path: penman/tree.py
from typing import Dict, List, Tuple, Set, Mapping, Any, Iterator
from penman.types import (Variable, Branch, Node)

        """
        Recreate node variables formatted using *fmt*.

        The *fmt* string can be formatted with the following values:

        - ``prefix``: first alphabetic character in the node's concept
        - ``i``: 0-based index of the current occurrence of the prefix
        - ``j``: 1-based index starting from the second occurrence
        """
        varmap: Dict[Variable, Variable] = {}
        used: Set[Variable] = set()
        for var, branches in self.nodes():
            if var not in varmap:
                concept = next((tgt for role, tgt in branches if role == '/'),
                               None)
                pre = _default_variable_prefix(concept)
                i = 0
                newvar = None
                while newvar is None or newvar in used:
                    newvar = fmt.format(
                        prefix=pre,
                        i=i,
                        j='' if i == 0 else i + 1)
                    i += 1
                used.add(newvar)
                varmap[var] = newvar

        self.node = _map_vars(self.node, varmap)



def _format(node: Node, level: int) -> str: