existing and reinforcing
Physical obstacles and mental obstacles. Physical obstacles refer to barriers that physically impede progress, such as walls or rocks. Mental obstacles are internal barriers like fear, self-doubt, or limiting beliefs that hinder one's ability to achieve their goals.
There are two main types of diffraction: Fraunhofer diffraction, which occurs in the far field of a diffracting object, and Fresnel diffraction, which occurs in the near field. Both types involve the bending of waves around obstacles or edges, resulting in the spreading of the wavefront.
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confirmation bias
His obstacles were actually getting the invention right, and to get some sleep because he was usually up after two in the morning!
cross country, show jumpig, point to point, racing . . . that's all i can think of ???
Two types. By saying there are two 'types' you are already stating that there are 2 differentthings and so the word 'different' isn't necessary.
two types are parasitic and saprophytic
There two types of cell procaryotic and eucaryotic.
Applications and data are two types of software.
two types of disccharides are sucrose and lactoes
eutrophication is of two types; natural and anthropogenic