diff --git a/.gitignore b/.gitignore
index 6a0c445..148252b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -27,4 +27,5 @@ test*.c*
 *.asm
 !mmw.so
 *.k
-!header.k
\ No newline at end of file
+!header.k
+!join.k
\ No newline at end of file
diff --git a/join.k b/join.k
new file mode 100644
index 0000000..0a220d8
--- /dev/null
+++ b/join.k
@@ -0,0 +1 @@
+{[I;L;R;i] t:&(I[i]);d:(#t);$[d=0;!0;+(Aa[t];Ab[t];d#(Bb[i]))]}[(Aa {x>(y*10)}/: Ba); Aa; Ba]'!#Aa
\ No newline at end of file