Checks if a given /nbn/ is a /chain/

Description

returns TRUE [the order] or FALSE [NULL] according that nbn is a chain of not [according to order].

Usage

1

Arguments

nbn

The nbn object to consider.

order

When FALSE the answer to the question is returned with TRUE or FALSE.
When TRUE the chain order of the nodes is returned if it is a /chain/ else NULL.

Value

A logical(1) when order si TRUE if not the resulting chain order versus NULL.

Examples

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2

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