/usr/share/doc/nasm/examples/strlen.asm is in nasm 2.09.10-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | %macro strlen_test 1
%strlen len %2 ; not existing argument
%endmacro
strlen_test 'a'
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