His customer, a Greek, dozes in the barberchair while being shaved.

The relation of logical implication over sentences is an example of a preorder.

XDR-TB is defined as tuberculosis that is resistant to the two most important antituberculosis drugs (isoniazid and rifampin), along with […] a member of the fluoroquinolone class and at least one of three others (capreomycin, kanamycin and amikacin).

I object to the proposal to build a new airport terminal.