diff --git a/deprecated/newfiles/__MACOSX/._diff_02.c b/deprecated/newfiles/__MACOSX/._diff_02.c
deleted file mode 100644
index cca5a7d..0000000
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diff --git a/deprecated/newfiles/__MACOSX/._left.txt b/deprecated/newfiles/__MACOSX/._left.txt
deleted file mode 100644
index 21263e9..0000000
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diff --git a/deprecated/newfiles/__MACOSX/._para.c b/deprecated/newfiles/__MACOSX/._para.c
deleted file mode 100644
index cbfd2c1..0000000
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diff --git a/deprecated/newfiles/__MACOSX/._para.h b/deprecated/newfiles/__MACOSX/._para.h
deleted file mode 100644
index a459444..0000000
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diff --git a/deprecated/newfiles/__MACOSX/._right.txt b/deprecated/newfiles/__MACOSX/._right.txt
deleted file mode 100644
index c24fbbd..0000000
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diff --git a/deprecated/newfiles/__MACOSX/._util.c b/deprecated/newfiles/__MACOSX/._util.c
deleted file mode 100644
index 84cc988..0000000
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diff --git a/deprecated/newfiles/__MACOSX/._util.h b/deprecated/newfiles/__MACOSX/._util.h
deleted file mode 100644
index ec18b79..0000000
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diff --git a/deprecated/newfiles/test_diff b/deprecated/newfiles/test_diff
new file mode 100755
index 0000000..b0513e9
Binary files /dev/null and b/deprecated/newfiles/test_diff differ
diff --git a/diff-rcm b/diff-rcm
index 1dd2e21..6c03fc5 100755
Binary files a/diff-rcm and b/diff-rcm differ
diff --git a/diff.c b/diff.c
index bc10a31..bb8532d 100644
--- a/diff.c
+++ b/diff.c
@@ -79,7 +79,6 @@ void diff_output_conflict_error(void) {
 void loadfiles(const char* filename1, const char* filename2) {
 
   if (filename2 == NULL) { printf("Usage: ./diff [options] file1 file2\n"); exit(1); }
-  if (*filename1 == *filename2) { exit(0); }
 
   memset(buf, 0, sizeof(buf));
   memset(strings1, 0, sizeof(strings1));
@@ -135,28 +134,53 @@ void help() {
 
 int normal(const char* filename1, const char* filename2) {
 
+  identical(filename1, filename2);
+
   printf("\nTHIS IS NOT NORMAL FOR NOW. THIS IS PLACEHOLDER. MMKAY.\n");
   printf("THIS IS NOT NORMAL FOR NOW. THIS IS PLACEHOLDER. MMKAY.\n");
   printf("THIS IS NOT NORMAL FOR NOW. THIS IS PLACEHOLDER. MMKAY.\n");
-  printf("THIS IS NOT NORMAL FOR NOW. THIS IS PLACEHOLDER. MMKAY.\n\n\n");
+  printf("THIS IS NOT NORMAL FOR NOW. THIS IS PLACEHOLDER. MMKAY.\n\n");
 
-  pa_print(p, printnormal);
+  //pa_print(p, printnormal);
 
   return 0;
 }
 int sideside(const char* filename1, const char* filename2) {
 
-  if (pa_equal(p, q)) { pa_print(p, printboth); return 0; }
-  pa_print(q, printright);
-  while ((q = pa_next(q)) != NULL && !equal) { equal = pa_equal(p, q); pa_print(q, equal ? printboth : printright); }
-  pa_print((p = pa_next(p)), printleft);
+  pa* qlast = q;
+  while (p != NULL) {
+    qlast = q;
+    foundmatch = 0;
+    while (q != NULL && (foundmatch = pa_equal(p, q)) == 0) { q = pa_next(q); }
+    q = qlast;
+
+    if (foundmatch) {
+      while ((foundmatch = pa_equal(p, q)) == 0) {
+        pa_print(q, printright);
+        q = pa_next(q);
+        qlast = q;
+      }
+      pa_print(q, printboth);
+      p = pa_next(p);
+      q = pa_next(q);
+    } else {
+      pa_print(p, printleft);
+      p = pa_next(p);
+    }
+  }
+  while (q != NULL) {
+    pa_print(q, printright);
+    q = pa_next(q);
+  }
 
   return 0;
 }
 void quiet(const char* filename1, const char* filename2) { if (pa_equal(p, q) == 0) { printf("The files are not the same.\n"); } else { return; } }
 void loud(const char* filename1, const char* filename2) {
 
-  if (pa_equal(p, q) != 0) { printf("The files are identical.\n"); }
+  if (*filename1 == *filename2 || (pa_equal(p, q) != 0)) { printf("The files are identical.\n"); }
   else { normal(files[0], files[1]); }
 
 }
+
+void identical(const char* filename1, const char* filename2) { if (*filename1 == *filename2) { exit(0); } else return; }
diff --git a/diff.h b/diff.h
index 41213a4..a7d79be 100644
--- a/diff.h
+++ b/diff.h
@@ -32,7 +32,7 @@ char *strings1[MAXSTRINGS], *strings2[MAXSTRINGS];
 
 int showversion = 0, showbrief = 0, ignorecase = 0, report_identical = 0, showsidebyside = 0;
 int showleftcolumn = 0, showunified = 0, showcontext = 0, suppresscommon = 0, diffnormal = 0;
-int showhelp = 0;
+int showhelp = 0, foundmatch = 0;
 
 int equal = 0, cnt = 0, count = 0;
 
@@ -53,3 +53,5 @@ int normal(const char* filename1, const char* filename2);
 int sideside(const char* filename1, const char* filename2);
 void quiet(const char* filename1, const char* filename2);
 void loud(const char* filename1, const char* filename2);
+
+void identical(const char* filename1, const char* filename2);
diff --git a/left.txt b/left.txt
new file mode 100644
index 0000000..bbae935
--- /dev/null
+++ b/left.txt
@@ -0,0 +1,25 @@
+This part of the
+document has stayed the
+sme from version to
+version. It shouldn't
+be shown if it doesn't
+change. Otherwise, that
+would not be helping to
+compress the size of the
+changes.
+
+This paragraph contains
+text that is outdated.
+It will be deleted in the
+near future.
+
+It is important to spell
+check this dokument. On
+the other hand, a
+misspelled word isn't
+the end of the world.
+Nothing in the rest of
+this paragraph needs to
+be changed. Things can
+be added after it.
+
diff --git a/pa.c b/pa.c
index 8503f77..18f947f 100644
--- a/pa.c
+++ b/pa.c
@@ -12,29 +12,83 @@ pa* pa_make(char* base[], int filesize, int start, int stop) {
   p->filesize = filesize;
   p->start = start;
   p->stop = stop;
+  p->firstline = (p == NULL || start < 0) ? NULL : p->base[start];
+  p->secondline = (p == NULL || start < 0 || filesize < 2) ? NULL : p->base[start + 1];
 
   return p;
 }
+
 pa* pa_first(char* base[], int size) {
   pa* p = pa_make(base, size, 0, -1);
   return pa_next(p);
 }
+
+void pa_destroy(pa* p) { free(p); }
+
 pa* pa_next(pa* p) {
-  if (p->stop == p->filesize) { return NULL; }
+  if (p == NULL || p->stop == p->filesize) { return NULL; }
 
   int i;
   pa* pnew = pa_make(p->base, p->filesize, p->stop + 1, p->stop + 1);
   for (i = pnew->start; i < p->filesize && strcmp(p->base[i], "\n") != 0; ++i) { }
   pnew->stop = i;
 
+  if (pnew->start >= p->filesize) {
+    free(pnew);
+    pnew = NULL;
+  }
   return pnew;
 }
+size_t pa_filesize(pa* p) { return p == NULL ? 0 : p->filesize; }
+
+size_t pa_size(pa* p) { return p == NULL || p->stop < p->start ? 0 : p->stop - p->start + 1; }
+
+char** pa_base(pa* p) { return p->base; }
+
+char* pa_info(pa* p) {
+  static char buf[BUFLEN];   // static for a reason
+  snprintf(buf, sizeof(buf), "base: %p, filesize: %d, start: %d, stop: %d\n",
+           p->base, p->filesize, p->start, p->stop);
+  return buf;  // buf MUST be static
+}
+
+int pa_equal(pa* p, pa* q) {
+  if (p == NULL || q == NULL) { return 0; }
+  if (pa_size(p) != pa_size(q)) { return 0; }
+  if (p->start >= p->filesize || q->start >= q->filesize) { return 0; }
+  int i = p->start, j = q->start, equal = 0;
+  while ((equal = strcmp(p->base[i], q->base[i])) == 0) { ++i; ++j; }
+  return 1;
+}
 
 void pa_print(pa* p, void (*fp)(const char*)) {
   if (p == NULL) { return; }
   for (int i = p->start; i <= p->stop && i != p->filesize; ++i) { fp(p->base[i]); }
 }
-void pa_destroy(pa* p) { free(p); }
+
+void pa_printfile(char* base[], int count, void (*fp)(const char*)) {
+  pa* p = pa_first(base, count);
+  while (p != NULL) {
+    pa_print(p, fp);
+    p = pa_next(p);
+  }
+  printline();
+}
+
+char* yesorno(int condition) { return condition == 0 ? "no" : "YES"; }
+
+FILE* openfile(const char* filename, const char* openflags) {
+  FILE* f;
+  if ((f = fopen(filename, openflags)) == NULL) {  printf("can't open '%s'\n", filename);  exit(1); }
+  return f;
+}
+
+void printline(void) {
+  for (int i = 0; i < 10; ++i) { printf("=========="); }
+  printf("\n");
+}
+
+
 void printleft(const char* left) {
   char buf[BUFLEN];
 
@@ -45,10 +99,12 @@ void printleft(const char* left) {
   buf[len + j++] = '\0';
   printf("%s\n", buf);
 }
+
 void printright(const char* right) {
   if (right == NULL) { return; }
   printf("%50s %s", ">", right);
 }
+
 void printboth(const char* left_right) {
   char buf[BUFLEN];
   size_t len = strlen(left_right);
@@ -56,39 +112,3 @@ void printboth(const char* left_right) {
   buf[len - 1] = '\0';
   printf("%-50s %s", buf, left_right);
 }
-
-void printnormal(const char* first) {
-  char buf[BUFLEN];
-  size_t len1 = strlen(first);
-  if (len1 > 0) { strncpy(buf, first, len1); }
-  buf[len1 - 1] = '\0';
-}
-
-size_t pa_filesize(pa* p) { return p == NULL ? 0 : p->filesize; }
-size_t pa_size(pa* p) { return p == NULL || p->stop < p->start ? 0 : p->stop - p->start + 1; }
-
-char** pa_base(pa* p) { return p->base; }
-char* yesorno(int condition) { return condition == 0 ? "no" : "YES"; }
-char* pa_info(pa* p) {
-  static char buf[BUFLEN];   // static for a reason
-  snprintf(buf, sizeof(buf), "base: %p, filesize: %d, start: %d, stop: %d\n",
-    p->base, p->filesize, p->start, p->stop);
-  return buf;  // buf MUST be static
-}
-
-int pa_equal(pa* p, pa* q) {
-
-  if (p == NULL || q == NULL) { return 0; }
-  if (pa_size(p) != pa_size(q)) { return 0; }
-  if (p->start >= p->filesize || q->start >= q->filesize) { return 0; }
-  int i = p->start, j = q->start, equal = 0, psize = p->filesize, qsize = q->filesize;
-  while (i < psize && j < qsize && (equal = strcmp(p->base[i], q->base[i])) == 0) { ++i; ++j; }
-  return 1;
-
-}
-
-FILE* openfile(const char* filename, const char* openflags) {
-  FILE* f;
-  if ((f = fopen(filename, openflags)) == NULL) {  printf("can't open '%s'\n", filename);  exit(1); }
-  return f;
-}
diff --git a/pa.h b/pa.h
index c7ba8ba..647d092 100644
--- a/pa.h
+++ b/pa.h
@@ -13,6 +13,8 @@ struct pa {
   int filesize;
   int start;
   int stop;
+  char* firstline;   // DEBUG only
+  char* secondline;
 };
 
 pa* p;
@@ -30,8 +32,9 @@ void pa_print(pa* p, void (*fp)(const char*));
 void printboth(const char* left_right);
 void printleft(const char* left);
 void printright(const char* right);
-void printnormal(const char* first);
+void pa_printfile(char* base[], int count, void (*fp)(const char*));
 FILE* openfile(const char* filename, const char* openflags);
 char* yesorno(int condition);
+void printline(void);
 
 #endif
diff --git a/right.txt b/right.txt
new file mode 100644
index 0000000..2d7f33d
--- /dev/null
+++ b/right.txt
@@ -0,0 +1,31 @@
+This is an important
+notice! It should
+therefore be located at
+the beginning of this
+document!
+
+This part of the
+document has stayed the
+sme from version to
+version. It shouldn't
+be shown if it doesn't
+change. Otherwise, that
+would not be helping to
+compress the size of the
+changes.
+
+It is important to spell
+check this document. On
+the other hand, a
+misspelled word isn't
+the end of the world.
+Nothing in the rest of
+this paragraph needs to
+be changed. Things can
+be added after it.
+
+This pragraph contains
+important new additions
+to this document.
+
+