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And the problem is ?????

Its shell and not c or other programming language.
If a shell is running a function in an other shell, everything defiend in the last shell is not available in the first shell.

Mels

$EX_LIST is not global and only filled within the get_first function.
If you change the last part to:
EX_LIST2=`get_first`

echo Printing out the result:
for nn in $EX_LIST2 ; do
echo...