fix the code def epsilon$\_$closure$($states$,$ epsilon$\_$transitions$)$:

closure $=$ set$($states$)$

stack $=$ list$($states$)$

while stack:

current$\_$state $=$ stack.pop$()$

if current$\_$state in epsilon$\_$transitions:

for next$\_$state in epsilon$\_$transitions$[$current$\_$state$]$:

if next$\_$state not in closure:

closure.add$($next$\_$state$)$

stack.append$($next$\_$state$)$

return closure

def nfa$\_$to$\_$dfa$($nfa$\_$states, alphabet, transitions, initial$\_$state, accepting$\_$states$)$:

epsilon$\_$transitions $=\{\}$ # Epsilon transitions in NFA

for state in nfa$\_$states:

epsilon$\_$transitions$[$state$]=$ set$()$

for state in nfa$\_$states:

if $(\text{'}\text{'},$ state$)$ in transitions:

epsilon$\_$transitions$[$state$].$update$($transitions$[(\text{'}\text{'},$ state$)])$

dfa$\_$states $=$ set$()$

dfa$\_$transitions $=\{\}$

dfa$\_$initial$\_$state $=$ epsilon$\_$closure$(\{$initial$\_$state$\},$ epsilon$\_$transitions$)$

dfa$\_$states.add$($tuple$($dfa$\_$initial$\_$state$))$

unprocessed$\_$states $=[$tuple$($dfa$\_$initial$\_$state$)]$

while unprocessed$\_$states:

current$\_$dfa$\_$state $=$ unprocessed$\_$states.pop$(0)$

for symbol in alphabet:

next$\_$states $=$ set$()$

for state in current$\_$dfa$\_$state:

# Calculate epsilon$-$closure of next$\_$states

next$\_$dfa$\_$state $=$ set$()$

for state in next$\_$states:

next$\_$dfa$\_$state.update$($epsilon$\_$closure$(\{$state$\},$ epsilon$\_$transitions$))$

# Convert to tuple because lists can't be dictionary keys

next$\_$dfa$\_$state $=$ tuple$($next$\_$dfa$\_$state$)$

# Add to DFA states if it's a new state

if next$\_$dfa$\_$state not in dfa$\_$states:

dfa$\_$states.add$($next$\_$dfa$\_$state$)$

unprocessed$\_$states.append$($next$\_$dfa$\_$state$)$

# Add transition to DFA

dfa$\_$transitions$[($current$\_$dfa$\_$state, symbol$)]=$ next$\_$dfa$\_$state

dfa$\_$accepting$\_$states $=[$state for state in dfa$\_$states if any$($s in accepting$\_$states for s in state$)]$

return dfa$\_$states, alphabet, dfa$\_$transitions, dfa$\_$initial$\_$state, dfa$\_$accepting$\_$states

# Example from your description

nfa$\_$states $=\{\text{'}90\text{'},\text{'}91\text{'},\text{'}92\text{'},\text{'}93\text{'},\text{'}94\text{'}\}$

alphabet $=\{\text{'}$a$\text{'},\text{'}$b$\text{'}\}$

transitions $=\{(\text{'}$a$\text{'},\text{'}90\text{'})$: $\{\text{'}91\text{'},\text{'}92\text{'},\text{'}93\text{'}\},$

$(\text{'}$a$\text{'},\text{'}91\text{'})$: $\{\text{'}94\text{'}\},$

$(\text{'}$a$\text{'},\text{'}93\text{'})$: $\{\text{'}94\text{'}\},$

$(\text{'}$b$\text{'},\text{'}92\text{'})$: $\{\text{'}93\text{'}\}\}$

initial$\_$state $=\text{'}90\text{'}$

accepting$\_$states $=\{\text{'}94\text{'}\}$

dfa$\_$states, dfa$\_$alphabet, dfa$\_$transitions, dfa$\_$initial$\_$state, dfa$\_$accepting$\_$states $=$ nfa$\_$to$\_$dfa$($

nfa$\_$states, alphabet, transitions, initial$\_$state, accepting$\_$states

$)$

# Display DFA

print$("$DFA States:", dfa$\_$states$)$

print$("$DFA Alphabet:", dfa$\_$alphabet$)$

print$("$DFA Transitions:", dfa$\_$transitions$)$

print$("$DFA Initial State:", dfa$\_$initial$\_$state$)$

print$("$DFA Accepting States:", dfa$\_$accepting$\_$states$)$