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Given the following text description, write Python code to implement the functionality described.
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Description:
Maximum length palindrome that can be created with characters in range L and R
Python3 implementation of the approach ; Function to return the length of the longest palindrome that can be formed using the characters in the range [ l , r ] ; 0 - based indexing ; Marks if there is an odd frequency character ; Length of the longest palindrome possible from characters in range ; Traverse for all characters and count their frequencies ; Find the frequency in range 1 - r ; Exclude the frequencies in range 1 - ( l - 1 ) ; If frequency is odd , then add 1 less than the original frequency to make it even ; Else completely add if even ; If any odd frequency character is present then add 1 ; Function to pre - calculate the frequencies of the characters to reduce complexity ; Iterate and increase the count ; Create a prefix type array ; Driver code ; Pre - calculate prefix array ; Perform queries

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Python Code:
N = 4 
 def performQueries(l , r , prefix ) : 
	 l -= 1 
 r -= 1 
 flag = False 
 count = 0 
 for i in range(26 ) : 
	 cnt = prefix[r ][i ] 
 if(l > 0 ) : 
	 cnt -= prefix[l - 1 ][i ] 
  if(cnt % 2 == 1 ) : 
	 flag = True 
 count += cnt - 1 
  else : 
	 count += cnt 
   if(flag ) : 
	 count += 1 
  return count 
  def preCalculate(s , prefix ) : 
	 n = len(s ) 
 for i in range(n ) : 
	 prefix[i ][ord(s[i ] ) - ord(' a ' ) ] += 1 
  for i in range(1 , n ) : 
	 for j in range(26 ) : 
	 prefix[i ][j ] += prefix[i - 1 ][j ] 
    s = "amim "
 prefix =[[ 0 for i in range(26 ) ] for i in range(N ) ] 
 preCalculate(s , prefix ) 
 queries =[[ 1 , 4 ] ,[3 , 4 ] ] 
 q = len(queries ) 
 for i in range(q ) : 
	 print(performQueries(queries[i ][0 ] , queries[i ][1 ] , prefix ) ) 
 
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