here is my log file and python code I am simulating mesi protocol, lecturer said there is a small bug

I cannot find it can you spot any bug here

C$3$ WR $41$ at address $7-$ Hit

C$1$ WR $48$ at address $10-$ Hit

C$1$ WR $10$ at address $10-$ Hit

C$1$ RD None at address $11-$ Miss

C$2$ RD None at address $0-$ Miss

C$3$ WR $50$ at address $14-$ Hit

C$0$ WR $68$ at address $7-$ Hit

C$1$ RD None at address $8-$ Miss

C$2$ WR $39$ at address $6-$ Hit

C$3$ RD None at address $0-$ Miss

C$0$ WR $41$ at address $9-$ Hit

C$3$ WR $14$ at address $10-$ Hit

C$0$ WR $17$ at address $5-$ Hit

C$3$ WR $79$ at address $8-$ Hit

C$0$ RD None at address $15-$ Miss

C$3$ RD None at address $2-$ Miss

C$2$ RD None at address $0-$ Miss

C$3$ RD None at address $6-$ Miss

C$1$ RD None at address $4-$ Miss

C$0$ WR $8$ at address $0-$ Hit

C$3$ WR $65$ at address $13-$ Hit

C$2$ RD None at address $14-$ Miss

C$2$ WR $24$ at address $10-$ Hit

C$2$ RD None at address $3-$ Miss

C$0$ RD None at address $12-$ Miss

C$0$ RD None at address $10-$ Miss

C$1$ WR $69$ at address $4-$ Hit

C$1$ RD None at address $15-$ Miss

C$1$ WR $83$ at address $2-$ Hit

C$1$ WR $32$ at address $6-$ Hit

C$1$ RD None at address $15-$ Miss

C$3$ RD None at address $12-$ Miss

C$0$ RD None at address $11-$ Miss

C$0$ WR $53$ at address $6-$ Hit

C$1$ RD None at address $11-$ Miss

C$2$ RD None at address $4-$ Miss

C$0$ RD None at address $10-$ Miss

C$0$ RD $8$ at address $12-$ Hit

class MESIProtocol:

def $\_\_$init$\_\_($self$,$ cores$)$:

self.cores $=$ cores

def read$($self$,$ core, address$)$:

sharing$\_$cores $=[$c for c in self.cores if c $!=$ core and self.find$\_$line$\_$in$\_$cache$($c$.$cache, address$)]$

line $=$ self.find$\_$line$\_$in$\_$cache$($core$.$cache, address$)$

if not line:

line $=$ self.load$\_$line$\_$from$\_$memory$($core$,$ address, sharing$\_$cores$)$

if line.state $==\text{'}$I$\text{'}$:

if any$($c$.$cache.find$\_$line$\_$in$\_$cache$($address$).$state $==\text{'}$M$\text{'}$ for c in sharing$\_$cores$)$:

for c in sharing$\_$cores:

self.flush$\_$if$\_$modified$($c$.$cache.find$\_$line$\_$in$\_$cache$($address$))$

c$.$cache.find$\_$line$\_$in$\_$cache$($address$).$state $=\text{'}$S$\text{'}$

line.state $=\text{'}$S$\text{'}$ if sharing$\_$cores else $\text{'}$E$\text{'}$

return line.value

def write$($self$,$ core, address, value$)$:

self.invalidate$\_$others$($core$,$ address$)$

line $=$ self.find$\_$line$\_$in$\_$cache$($core$.$cache, address$)$

if not line:

line $=$ self.load$\_$line$\_$from$\_$memory$($core$,$ address$)$

if line.state $==\text{'}$E$\text{'}$ or line.state $==\text{'}$S$\text{'}$:

self.flush$\_$if$\_$modified$($line$)$

line.value $=$ value

line.state $=\text{'}$M$\text{'}$

def invalidate$\_$others$($self$,$ core, address$)$:

for other$\_$core in self.cores:

if other$\_$core $!=$ core:

line $=$ self.find$\_$line$\_$in$\_$cache$($other$\_$core.cache, address$)$

if line and line.state $!=\text{'}$I$\text{'}$:

self.flush$\_$if$\_$modified$($line$)$

line.state $=\text{'}$I$\text{'}$

def load$\_$line$\_$from$\_$memory$($self$,$ core, address, sharing$\_$cores$)$:

is$\_$shared $=$ any$($self$.$find$\_$line$\_$in$\_$cache$($c$.$cache, address$)$ for c in sharing$\_$cores if c $!=$ core$)$

line $=$ core.cache.replace$\_$line$($core$.$cache.find$\_$line$($address$),$ address, core.memory.storage$[$address$],$ False$)$

line.state $=\text{'}$S$\text{'}$ if is$\_$shared else $\text{'}$E$\text{'}$

return line

def find$\_$line$\_$in$\_$cache$($self$,$ cache, address$)$:

set$\_$index $=$ cache.find$\_$line$($address$)$

set$\_=$ cache.sets$[$set$\_$index$]$

for line in set$\_$:

if line.address $==$ address and line.valid:

return line

return None

def flush$\_$if$\_$modified$($self$,$ line$)$:

if line.state $==\text{'}$M$\text{'}$:

line.memory.storage$[$line$.$address$]=$ line.value # Flush to memory

line.dirty $=$ False