Q: The return address is not required on postal mail. However, lack of a return address prevents the postal service from being able to return the item if it proves undeliverable; such as from damage, postage due, or invalid destination. Such mail may otherwise become dead letter mail.
Can we conclude that is it possible to send a letter without return address?
A: yes

Q: Mini-ITX is a 17 17 cm (6.7 6.7 in) motherboard, developed by VIA Technologies in 2001. They are commonly used in small-configured computer systems. Originally, they were a niche product, designed for fan-less cooling with a low power consumption architecture, which made them useful for home theater PC systems, where fan noise can detract from the cinema experience. The four mounting holes in a Mini-ITX board line up with four of the holes in ATX-specification motherboards, and the locations of the backplate and expansion slot are the same (though one of the holes used was optional in earlier versions of the ATX spec). Mini-ITX boards can therefore often be used in cases designed for ATX, micro-ATX and other ATX variants if desired.
Can we conclude that can you put a mini itx motherboard in an atx case?
A: yes

Q: Dressing up as a police officer in costume (e.g. for Halloween), or pretending to be a police officer for the purpose of play or a harmless prank toward an acquaintance is generally not considered a crime, provided that those involved recognize the imposter is not a real police officer, and the imposter is not trying to deceive those involved into thinking he/she is. Nevertheless, replica police uniforms sold in the UK must not be identical to the uniforms currently used by the police, and traders have been jailed in the past for selling on genuine uniforms
Can we conclude that can you dress as a cop for halloween?
A: yes

Q: Anaphylaxis is a serious allergic reaction that is rapid in onset and may cause death. It typically causes more than one of the following: an itchy rash, throat or tongue swelling, shortness of breath, vomiting, lightheadedness, and low blood pressure. These symptoms typically come on over minutes to hours.
Can we conclude that true or false anaphylaxis generally only affects the skin and eyes?
A:
no