"&&" and "and" have differing precedences. "and" is lower precedence than "&&". The same goes for "||" and "or"; "or" has lower precedence than "||". "and" actually has lower precedence than "||", as I will demonstrate.
code with "&&":
perl -e 'if(0&& 0||1){print"hello\n"}'
output:
hello
code with "and":
perl -e 'if(0and 0||1){print"hello\n"}'
(outputs nothing)
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