《汉书·志·艺文志》
大概是有原因就容易一些，没有原因就困难一点，所以依照旧书来编排数术为六种。
盖有因而成易，无因而成难，故因旧书以序数术为六种。
Probably when there is a reason, it is easy; when there is no reason, it is difficult. Thus, based on the ancient books, the number arts were classified into six types.
<s>[INST] Translate the following Classical Chinese text into English: 盖有因而成易，无因而成难，故因旧书以序数术为六种。 [/INST] Probably when there is a reason, it is easy; when there is no reason, it is difficult. Thus, based on the ancient books, the number arts were classified into six types.</s>
Translate the following Classical Chinese text into English: 盖有因而成易，无因而成难，故因旧书以序数术为六种。
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Probably when there is a reason, it is easy; when there is no reason, it is difficult. Thus, based on the ancient books, the number arts were classified into six types.
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