If I have a hash like: 
'abc,def' => { 
              ,,,item4   ,
              item1,,,   ,
              ,item2,,   
             }

[download]
'klm,mno' => {
               ,item2,,  ,
               ,,item3,  ,
              }

[download]

I want to the merge the multiple rows with the same key as follow: how should I do it ? 

'abc,def' => {item1,item2,,item4 ,}
'klm,mon' => {,item2,item3,      ,}

[download]
how to do it using hash? thanks

In reply to merge with multiple row with same key by tcheungcm

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