 (2014) እና Yang, Santillana, and Kou (2015) እነዚህን ሁለት ችግሮች ማስወገድ ችለዋል.
Ndipotu, pogwiritsa ntchito njira zowonongeka, Lazer et al. (2014) ndi Yang, Santillana, and Kou (2015) adatha kupeŵa mavuto awiriwa.