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echo $(( --7 ))
echo $(( ++7 ))
echo $(( -- 7 ))
echo $(( ++ 7 ))

((++array[0] ))
echo $array
(( ++ array[0] ))
echo $array

(( ++a ))
echo $a
(( ++ a ))
echo $a

(( --a ))
echo $a
(( -- a ))
echo $a

echo $(( 4 + ++a ))
echo $a

echo $(( 4+++a ))
echo $a

echo $(( 4---a ))
echo $a

echo $(( 4 - -- a ))
echo $a

(( -- ))
echo $(( ---7 ))
echo $(( -- - 7 ))

(( ++ ))
echo $(( ++7 ))
echo $(( ++ + 7 ))

echo $(( ++-7 ))
echo $(( ++ - 7 ))

echo $(( +--7 ))
echo $(( -- + 7 ))