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Copyright of articles published by the African Scientific Reports is retained by the author(s). Articles are published under a Creative Commons Attribution 4.0 International License. This license allows for maximum dissemination and re-use of open access materials and is preferred by many research funding bodies. Under this license, users are free to share (copy, distribute and transmit) and remix (adapt) the contribution including for commercial purposes, providing they attribute the contribution in the manner specified by the author or licensor.