A contravariant functor F:𝒞→𝒟 is the same as a covariant functor F:𝒞ᵒᵖ→𝒟.

The Backus pin-setter is almost human in its operation.

It is estimated that at least 15% of breastfeeding women use herbal galactagogues at some point (The National Children′s Study, 2003).

Thor jumped off the sledge to undo the gate, and as we merrily drove up to the door we were met by the boisterous welcome of old Rover, who in his frantic joy at hearing my voice almost broke his chain in trying to rush at me.