and as a frequent substitute for Peter Jennings, who has been ill with lung cancer.
Mr. Hayes, for instance, is a frequent substitute for Lawrence O'Donnell and for Rachel Maddow, two MSNBC anchors.
But the most interested, you might think, is his frequent substitute, the Italian conductor Fabio Luisi.
For the moment at least Milner is happy to accept being a frequent substitute rather than a regular starter.
The atomic radii of iron and nickel are both approximately 1.24 Å, and so nickel is a frequent substitute for iron.
Tamarind and its frequent substitute, goraka, add tang to curries, and Maldives fish, a smoked and sun-dried skipjack tuna that is shaved, is used for salt and depth in condiments and broths.
Though Mr. Gregory was widely respected inside NBC News for his political coverage, he had another advantage over the other candidates: his role as a frequent substitute host for Mr. Lauer on NBC's most important news program, "Today".
Several MSNBC employees, who spoke about programming plans on the condition of anonymity, said the most likely candidate for a new show was the Washington Post columnist Ezra Klein, a frequent substitute for Ms. Maddow.
Much camel's hair in natural colours was used in the pile, often forming a broad band at the edges of the rug; but wool dyed in camel colours was a frequent substitute.
An irregular starter in their League One campaign, but frequent substitute, he asked for a move when omitted at the start of the 2006-07 seandn and was unexpectedly signed, on transfer deadline day, by Warnock.
