write function delfromend (naming things is hard) such that

 'cabd' delfromend 'cbaab'
ba

18 (delfromend~ ; delfromend)&q: 54
┌┬─┐
││3│
└┴─┘

 'aaaa' delfromend 'cbaab'
cbb

 

removes as many instances of x that exist in y.  Taking out items from the end 
of y.  Though a bit easier is to just group items by "key" for output.


(,<'a') delfromend ;/ 'cbaab'
┌─┬─┬─┬─┐
│c│b│b│a│
└─┴─┴─┴─┘
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