Strength of sequence vs alternative parsers

Hello,

Am I correct in observing that the Sequence parser (>>) is stronger
than the alternative parser (|)?

i.e.

my_rule = a >> b >> c | d >> e >> f ;

So, in other words, parenthesis are unnecessary, per se?

my_rule = ( a >> b >> c ) | ( d >> e >> f ) ;

Unless those groupings require additional operators, like Optional
(-), let's say.

my_rule = ( a >> b >> c ) | ( d >> -( e >> f ) ) ;

Thanks!

Cheers,

Michael Powell

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