What type of details about sam walker -lrb- rugby union -rrb- can be gathered from the following bio? Bio: samuel '' sam '' walker -lrb- 21 april 1912 -- 20 january 1972 -rrb- was an irish rugby union prop . walker played club rugby for instonians and played international rugby for ireland and was captain of the british isles team in their 1938 tour of south africa .
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