linux - how to combine two variable column-by-column in bash -

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i have 2 variables, multi-line.

var1="1 2 3 4"  var2="ao ad af ae"

i want 

var3="1ao 2ad 3af 4ae"

i know can by:

echo "$var1" > /tmp/order echo "$var2" | paste /tmp/order  -

but there way without temp file?

paste <(echo "$var1") <(echo "$var2") --delimiters ''


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