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The syntax isn't the same between bash and ksh :

#!/usr/bin/bash

declare -a mon
mon=( Jan Feb Mar Apr )

echo ${#mon }
echo ${mon[2]}
#!/usr/bin/ksh

set -A mon -- Jan Feb Mar Apr
...

cmlist01=( a b c d e)
cmlist02=( f g h i )
cmlist03=( j k l )

for listnbr in cmlist01 cmlist02 cmlist03
do
eval "printf 'There are %d items in %s:\n' \"\${#${listnbr}[@]}\" \"$listnbr\""
...