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10 groups solved 15 problems in each of 8 conditions: 4-and 5-man groups (4-m, 5-m) in "Wheel" (W) and "Circle" (C) structures under 2 levels of task difficulty, H = 1.6 and H= 2.4 (H is information entropy). Solution-time data showed: (a) no difference between 4-and 5-m in W on H = 1.6, H = 2.4, and in C on H = 2.4, while in C on H = 1.6 4-m was faster than 5-m; (b) W was faster than C in 4-m on H = 2.4 and 5-m on H = 1.6 and H = 2.4, while 4-m on H = 1.6 no differences between W and C were obtained; (c) H = 1.6 was faster than H = 2.4 in 4-m in both W and C and in 5-m in W, while in 5-m C no differences between H= 1.6 and H = 2.4 were obtained. Error data showed W making fewer errors than C in both 4-and 5-m on H = 1.6.

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