The syntax for slicing in Perl is very, very simple:

    @{EXPRESSION} {LIST}
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(or with [LIST] if you're slicing an array.) EXPRESSION is an expression (or block) which evaluates to a reference to a hash (or array). As a special case, the EXPRESSION may be an identifier too. If the EXPRESSION is simple, one may leave the braces off.

This explains how the presented solutions work.

Abigail