The phrase "a combination of existing" is correct and usable in written English.
It can be used when describing something that is made up of various elements that are already present or available.
Example: "The new software is a combination of existing technologies that enhance user experience."
Alternatives: "a blend of current" or "a mixture of available".
It is actually a combination of existing services which combine to create supercomputing capabilities.
The plan isn't anything too radical for Apple, just a combination of existing programs mostly, but combining generous trade-in offers with an installment plan that isn't gouging cash-strapped customers is awesome to see.
Ultimately it's nothing new, it's a combination of existing technologies put together in a structure".
Picking a route is vital for crowd avoidance, so my climbing partner and I tested the TK Lemosho – developed in 2008 by mountaineers from the family-owned tour operator Team Kilimanjaro, it is a combination of existing routes.
During the review process, some suggested that we may also be able to preserve the capabilities we need through a combination of existing authorities, better information sharing, and recent technological advances.
The field draws on a combination of existing disciplines, each contributing a unique perspective.
It may be a novel combination of existing resources or a radical invention.
Still, he says, the work is a "fantastic" combination of existing methods to answer a new question.
Drawing on Christensen's work on disruptive innovations, our analysis shows how frugal use of resources through a new combination of existing component technologies created a new modular product to achieve the unique price performance requirements demanded by the BoP.
They have viewed the firm as a complex system of routines, and innovation as the product of a new combination of existing routines.
Basically, what Mr. Amos has patented is a new combination of existing technologies.
