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(d) Programs and Computers

All programs used for analyses were written in Pascal (Jensen and Wirth, 1978; Schneider et al., 1982, 1984). The major programs used were:

Name  $\;$
Version Purpose 


CalHnb 2.15 		$\parbox{4in}{calculate statistics of $H_{nb}$ : $E(H_{nb})$ , $AE(H_{nb})$\space and$Var(H_{nb})$\space (generates Fig. 12).}$



Rseq 		 4.46 		$\parbox{4in}{information content of sequences, $R_{sequence}$\space ascalculated in this paper (with correction for sampling error).}$



RsGra 		 2.45 		$\parbox{4in}{a non-standard FORTRAN program using device independentgraphics (Warner, 1979) for drawing the figures on microfilm.}$

Most work was performed on a CDC Cyber 170/720 computer. Figures were generated on a CDC 280/284 microfilm recorder.