{"name": "组合学", "children": [{"name": "[循]环排列", "en": "circular permutation", "superfield": "数学"}, {"name": "三元系", "en": "triple system", "superfield": "数学"}, {"name": "不完全区组设计", "en": "incomplete block design", "superfield": "数学"}, {"name": "余正二次型", "en": "copositive quadratic form", "superfield": "数学"}, {"name": "分圆数", "en": "cyclotomic number", "superfield": "数学"}, {"name": "分配问题", "en": "distribution problem", "superfield": "数学"}, {"name": "剩余区组设计", "en": "residual block design", "superfield": "数学"}, {"name": "区组设计", "en": "block design", "superfield": "数学"}, {"name": "区组设计的关联矩阵", "en": "incidence matrix of a block design", "superfield": "数学"}, {"name": "区组设计自同构", "en": "automorphism of block design", "superfield": "数学"}, {"name": "反称型阿达马矩阵", "en": "Hadamard matrices of skew type", "superfield": "数学"}, {"name": "填装", "en": "packing", "superfield": "数学"}, {"name": "完全区组设计", "en": "complete block design", "superfield": "数学"}, {"name": "完全设计", "en": "complete design", "superfield": "数学"}, {"name": "对偶区组设计", "en": "dual block design", "superfield": "数学"}, {"name": "对称区组设计", "en": "symmetric block design", "superfield": "数学"}, {"name": "导出区组设计", "en": "derived block design", "superfield": "数学"}, {"name": "平衡不完全区组设计", "en": "balanced incomplete block design", "superfield": "数学"}, {"name": "平衡区组设计", "en": "balanced block design", "superfield": "数学"}, {"name": "平衡设计", "en": "balanced design", "superfield": "数学"}]}