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8 changes: 6 additions & 2 deletions Projects/2_Classical Planning/layers.py
Original file line number Diff line number Diff line change
Expand Up @@ -2,8 +2,12 @@
from copy import deepcopy
from functools import lru_cache
from itertools import combinations
from collections import defaultdict, MutableSet

try:
from collections import defaultdict, MutableSet
except ImportError:
from collections.abc import MutableSet
from collections import defaultdict

from aimacode.planning import Action
from aimacode.utils import expr, Expr

Expand Down