What does samflag 1028 mean?

Hi,
On sam flags explained, the flag 1028 corresponds to "read unmapped" and "read is PCR or optical duplicate".
broadinstitute.github.io/picard/explain-flags.html
If I run samtools view -F 1028 input.bam > output.bam
Will output.bam contain reads which are **only** "read unmapped" and "read is PCR or optical duplicate" or **no** reads that are "read unmapped" and "read is PCR or optical duplicate"?
Thanks!



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