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You might try something like:
awk '
BEGIN { FS = "[|]ÇÞ[|]"
OFS = "|ÇÞ|"
}
NR == FNR {
for(i = 2; i <= NF; i++)
v[$1, i] = $i
next
}
{ printf("%s%s", $1, (NF > 1) ? OFS : ORS)
for(i =...