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  1. or download this
    eval "&$s()";
    
  2. or download this
    &{ &UNIVERSAL::can('main', $s) }();
    
  3. or download this
    my $funcRef = &UNIVERSAL::can('main', $s);
    if( ref($funcRef) eq 'CODE' ) { &$funcRef(); }
    else { warn "Function $s not found in package main!"; }