V10/vol2/anim/race.splice

awk '  # merge two sort animations
BEGIN {	# file name   label                status of last getline
    f1 = "is.s";      l1 = "view insert";  s1 = 1
    f2 = "qs.s";      l2 = "view quick";   s2 = 1
    sep = "click comp"
    while (s1 && s2) {
        print l1; while ((s1 = getline <f1) > 0 && $0 != sep) print
        print l2; while ((s2 = getline <f2) > 0 && $0 != sep) print
        print sep
    }
    if (s1 > 0) { print l1; while (getline <f1) print }
    if (s2 > 0) { print l2; while (getline <f2) print }
}' >race.s