The phrase "allows the existence of" is correct and usable in written English.
It can be used when discussing conditions or factors that enable something to be present or occur.
Example: "The new policy allows the existence of more flexible work hours for employees."
Alternatives: "permits the presence of" or "facilitates the occurrence of".
I wouldn't classify Dos Santos as a dictator; he respects some differences and allows the existence of other political parties.
Mr. Colbert, the Comedy Central television host, has made jokes at the expense of super PACs for months — forming his own group, soliciting money for it, then running an ad that featured Buddy Roemer, a long-shot candidate who has criticized the Supreme Court decision that allows the existence of the free-spending PACs so long as they do not explicitly coordinate with candidates.
The first allows the existence of dispositional properties in addition to ordinary properties (Clifton 1996).
(B) Re-demarcation of the TALE repeat allows the existence of integral number of repeats in TAL effectors.
Our previous model allows the existence of numerous patches, but here we have used the minimum number of patches.
Namely, the structure of the resulting silica gel was successfully tailored to be mesoporous, which allows the existence of a stable ACC phase.
If different laws or physical constants prevail in other bubble universes, the conditions may not allow the existence of life or intelligence, he explained.
Private ownership in the media sector must be structured to allow the existence of a credible, independent, vibrant and high-quality Fourth Estate.
The trial judge, Mrs Justice Nicola Davies, allowed the existence of the reward to go before the jury but not Massey's approach and rejected the claim it had the "flavour of a bribe".
Pius' pontificate soon witnessed the rise to power of Benito Mussolini, who signed (Feb. 11, 1929) with him the Lateran Treaty that allowed the existence of the independent Vatican City state, over which the pope ruled.
