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By analyzing $2.93\ \rm fb^{-1}$ of data taken at the $\psi(3770)$ resonancepeak with the BESIII detector, we measure the branching fractions for thehadronic decays $D^+\to K^0_SK^0_S K^+$, $D^+\to K^0_SK^0_S \pi^+$, $D^0\toK^0_S K^0_S$ and $D^0\to K^0_SK^0_SK^0_S$. They are determined to be ${\mathcalB}(D^+\to K^0_SK^0_SK^+)=(2.54 \pm 0.05_{\rm stat.} \pm 0.12_{\rm sys.})\times10^{-3}$, ${\mathcal B}(D^+\to K^0_SK^0_S\pi^+)=(2.70 \pm 0.05_{\rm stat.} \pm0.12_{\rm sys.})\times 10^{-3}$, ${\mathcal B}(D^0\to K^0_SK^0_S)=(1.67 \pm0.11_{\rm stat.} \pm 0.11_{\rm sys.})\times 10^{-4}$ and ${\mathcal B}(D^0\toK^0_SK^0_SK^0_S)=(7.21 \pm 0.33_{\rm stat.} \pm 0.44_{\rm sys.})\times10^{-4}$, where the second one is measured for the first time and the othersare measured with significantly improved precision over the previousmeasurements.

Measurements of the branching fractions for $D^+\to K^0_SK^0_SK^+$, $K^0_SK^0_S\pi^+$ and $D^0\to K^0_SK^0_S$, $K^0_SK^0_SK^0_S$