Abstract: I welcome you to the fourth issue of the IEEE Communications Surveys and Tutorials in 2021. This issue includes 23 papers covering different aspects of communication networks. In particular, ...

How to play Slope Game: Control the Ball: Use the arrow keys (left and right) or A/D to steer the ball. Precision is key – oversteer, and you'll plummet off the edge; undershoot, and you'll crash into ...

This is the open source version of Scratch 2.0 and the core code for the official version found on http://scratch.mit.edu. This code has been released under the GPL ...

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