ruby - Remove duplicate text from multiple strings -

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i have:

a = "this product property b , propery c. buy now!" b = "this product b property x , propery y. buy now!" c = "this product c having no properties. buy now!"

i'm looking algorithm can do:

> magic(a, b, c) => ['a property b , propery c',      'b property x , propery y',      'c having no properties']

i have find duplicates in 1000+ texts. super performance isn't must, nice.

-- update

i'm looking sequence of words. if:

d = 'this product d text engraving: "buy". buy now!'

the first "buy" should not duplicate. i'm guessing have use threshold of n words following eachother in order seen duplicate. 

def common_prefix_length(*args)   first = args.shift   (0..first.size).find_index { |i| args.any? { |a| a[i] != first[i] } } end  def magic(*args)   = common_prefix_length(*args)   args = args.map { |a| a[i..-1].reverse }   = common_prefix_length(*args)   args.map { |a| a[i..-1].reverse } end 
a = "this product property b , propery c. buy now!" b = "this product b property x , propery y. buy now!" c = "this product c having no properties. buy now!"  magic(a,b,c) # => ["a property b , propery c", #     "b property x , propery y", #     "c having no properties"]

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