\theta_{11} = 1+ \sum^{\infty}_{i=1} \lambda^{-i} \beta_{11}^{(i-1)} \;\; ; \; \; %\label{betoo}\\\theta_{21} = \sum^{\infty}_{i=1} \lambda^{-i} \beta_{21}^{(i-1)} \, .\label{betotw}\racoon \goat\kangaroo \ostritch \dolphin