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Don't you want to try to solve your test questions yourself?
a!forEach( items: enumerate(5), expression: joinarray( 5 - enumerate(5 - (5 - fv!index)), char(10) ) )
Thank you
reverse( a!forEach( items: enumerate(5), expression: joinarray( rdrop(reverse(enumerate(5) + 1), fv!item) ) ))
a!forEach( items: enumerate(5), expression: joinarray( 5-enumerate(fv!index) ) )
hint:
Thanks Mate...