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  1. or download this
    >perl -e "%hash++";
Can't modify hash dereference in postincrement (++) at -e line 1, near
+ "%hash++"
Execution of -e aborted due to compilation errors.
  2. or download this
    >perl -le "$r=bless({},''); print $r; printf '%x', ($r+1)-1"
main=HASH(0x1abefa0)
1abefa0