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==实现==
==实现==
实现
实现
{| class = "wikitable" align="right" style="width:18em;"
{| class = "wikitable" align="right" style="width:18em;"
| b || adjacent to || a,c
| b || adjacent to || a,c
b | |毗邻| |a，c
|-
|-
| c || adjacent to || a,b
| c || adjacent to || a,b
c | |毗邻| |a，b
|}
|}