Elseif in unless RUBY

Consider the following unless statement with elsif conditions can be modified into if..elsif statement.

unless true
  puts "one"
elsif true
  puts "two"
else
  puts "three"
end

#Above one will result error. Lets try to modify this statement in if..elsif statement as follows:

unless true
  puts "one"
else if true
    puts "two"
  else
    puts "three"
  end
end

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