usage: mutool merge [-o output.pdf] [-O options] input.pdf [pages] [input2.pdf] [pages2] ...
	-o -	name of PDF file to create
	-O -	comma separated list of output options
	input.pdf	name of input file from which to copy pages
	pages	comma separated list of page numbers and ranges

PDF output options:
	decompress: decompress all streams (except compress-fonts/images)
	compress: compress all streams
	compress-fonts: compress embedded fonts
	compress-images: compress images
	ascii: ASCII hex encode binary streams
	pretty: pretty-print objects with indentation
	linearize: optimize for web browsers
	clean: pretty-print graphics commands in content streams
	sanitize: sanitize graphics commands in content streams
	garbage: garbage collect unused objects
	incremental: write changes as incremental update
	continue-on-error: continue saving the document even if there is an error
	or garbage=compact: ... and compact cross reference table
	or garbage=deduplicate: ... and remove duplicate objects
	decrypt: write unencrypted document
	encrypt=rc4-40|rc4-128|aes-128|aes-256: write encrypted document
	permissions=NUMBER: document permissions to grant when encrypting
	user-password=PASSWORD: password required to read document
	owner-password=PASSWORD: password required to edit document
	regenerate-id: (default yes) regenerate document id

