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contrived acronym for "Completely Automated Public Turing test to tell Computers and Humans Apart." A historically common type of CAPTCHA (displayed as Version...

difficult to tell apart, and even the ancient mythographers appear to have been perplexed about which Aeolus was which. Diodorus Siculus made an attempt to define...

"Black Hawk Down was criticized because the characters seemed hard to tell apart. We Were Soldiers doesn't have that problem; in the Hollywood tradition...

in part abandoned due to its similarity to the Greek jack and the Swedish flag, which critics reasoned would be hard to tell apart at sea, a major issue...

xylokopos/ξυλοκόπος "wood-cutter". Many species in this enormous genus are difficult to tell apart; most species are all black, or primarily black with some yellow or...

Flavivirus. The disease may be difficult to tell apart from other illnesses, especially in the early stages. To confirm a suspected case, blood-sample testing...

and neck, with white (ochre in one species) markings that can be used to tell apart most species. As with most geese, their undertail and uppertail coverts...

Females are 9 to 12 mm (0.35 to 0.47 in) in body length, while males are 9 to 11 mm (0.35 to 0.43 in). The sexes are easy to tell apart as the males have...

streamlined body typical of the requiem sharks, this species is difficult to tell apart from other large members of its family such as the dusky shark (C. obscurus)...

less framing than the A6M). While relatively easy for a trained eye to tell apart with the "finer" lines of the Ki-43's fuselage – especially towards...

effective were found to be the quinolones and sulfamethoxazole/trimethoprim. The two bacterial species can be difficult to tell apart. "Genus Burkholderia"...

flowers (family Asteraceae) that have yellow flowers and can be difficult to tell apart in the field. It is a jocular term, and sometimes reserved for those...

As with the other dynasties, their style is very similar, and hard to tell apart in the absence of a signature or date, or evidence of location. Many...

arms. Many of the species are circum-Antarctic and can be difficult to tell apart without DNA sequencing. There are eight accepted species of Promachocrinus...

hover around flowers, as well, rendering some bombyliid species hard to tell apart from Syrphidae at first glance. Hoverflies can, nevertheless, be distinguished...

of production. Externally the cars are very difficult to tell apart. There were some changes to the 14/28 chassis and suspension and the brake servo was...

possibly because it degrades easily, and possibly because it is difficult to tell apart from the much more pervasive conifer samples. Like conifer wood, it...

is the most distinctive of the saber-tooth mammals and is also easy to tell apart. It differs from machairodonts in possessing a very prominent flange...

to medium-sized tree which grows to height of 12m. It is difficult to tell apart from Vachellia nilotica subsp. adstringens without examining the seed...

However, their taxonomy is poorly understood and species are difficult to tell apart, especially those that are brown or black without other pattern. Therefore...