to organize a variation experience and they generate interactions between learners and the object of learning. In this paper,rather than patterns, I consider them as types of variation interaction that could build up mathematical experience. A variation interaction is a strategic use of variation to interact with a mathematics. "/>
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Climate Activists Protest Congressional Baseball Game, Washington, d.c., United States - 28 Jul 2022

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A male Santa Marta sabrewing. The species was rediscovered in Colombia's Sierra Nevada de Santa Marta in July 2022. The hummingbird had not had a documented sighting in 12 years. It was only the second time the hummingbird has been documented since it was first collected in 1946. (Photo by Yurgen Vega/SELVA/ProCAT)

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OrganEx technology reverses certain deleterious effects of prolonged ischemia. Representative images of electrocardiogram tracings in the heart(top), immunostainings for albumin in the liver(middle),and actin in the kidney(bottom).The images on the left side represent the organs subjected to a control perfusion, while the images on the right represents the organs subjected to perfusion with theOrganEx technology. Tissue integrity and certain cellular functions have been restored by theOrganEx technology one hour after circulatory arrest.

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2F8Y7GF Spacetime Scifi Digital Arts concept, Twist clock time distortion warp on space bended curved as hole represent Space and Times of Einstein Theory

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TOPSHOT - An attending physician listens to the breathing of a patient who is recovering after admission to an intensive care unit (ICU) in the coronavirus (COVID-19) patient nursing department of The HMC Westeinde Hospital in The Hague on April 4, 2020. (Photo by Remko DE WAAL / ANP / AFP) / Netherlands OUT (Photo by REMKO DE WAAL/ANP/AFP via Getty Images)

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