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. 2022 Apr 29;8:33. doi: 10.1038/s41522-022-00300-4

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© The Author(s) 2022

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — a The experimental set-up of the first set of experiments comprising of the tap, the water tank, the tubing and valves, the channels (1-3 for LVF, 4-6 for SF and 7-9 for SVF), and the water basin in the sink. b The inside of a SVF channel (17 cm length and 2.6 cm width) with the location of the slide sections (inlet, middle and outlet) which are 5 in total of 3 cm length and separate from each other by 0.4 cm, and the position of the triangular object (a = 0.6 cm and b = 0.2 cm) at 3 cm from the entrance.