How do I move an index in the 'each' back ward or repeat itself at
certain point?

a.each do |i|
 b.each do |j|
   if a[4] == b[4]
   
   At this point I would like to advance the next index in a.each but
remain in b.each, another word, b[4] will not become b[5] after the
a[had advance], how can I do ?

   end

 end
end

Kinfe