Сгруппируйте синонимы1research field2branch use3various absolutely necessary4application investigation5indispensable

research. field. branch. use. various. absolutely. necessary. application. investigation. indispensable. different. curious. complicated. sophisticated. complex. level. to introduce. to assist. to carry out. to avert. to ward off. to prevent. to apply. to help. to perform. to execute.

research-investigation

field. branch.level

use to apply 

various.different curious

necessary indispensable

application use

complicated. sophisticated. complex.absolutely

to avert. to ward off. to prevent.

to help.to assist.

to perform. to execute. to carry out.to introduce.