diff --git a/src/main.py b/src/main.py
new file mode 100644
index 0000000..f31b547
--- /dev/null
+++ b/src/main.py
@@ -0,0 +1,69 @@
+#!~/.pyenv/versions/3.12.9/bin/python
+#
+# Copyright (c) 2024 Cutieguwu | Olivia Brooks
+#
+# -*- coding: utf-8 -*-
+# @Title: binder-calculator
+# @Author: Cutieguwu | Olivia Brooks
+# @Description: Calculates ranges of optical disc binders.
+#
+# @Script: main.py
+# @Date Created: 22 Mar, 2024
+# @Last Modified: 22 Mar, 2024
+# @Last Modified by: Cutieguwu | Olivia Brooks
+# --------------------------------------------
+
+from dataclasses import dataclass
+
+
+@dataclass
+class Domain:
+    _start: int
+    _end: int
+
+    def get_start(self) -> int:
+        return self._start
+    
+    def get_end(self) -> int:
+        return self._end
+    
+    def get_range(self) -> tuple[int, int]:
+        return (self.get_start(), self.get_end())
+
+
+class Calculator:
+    def __init__(self) -> None:
+        self.BINDER_SIZE: int = 128
+
+    def calculate_domain(self, index: int) -> Domain:
+        return Domain(
+            self.calc_start(index),
+            self.calc_end(index)
+        )
+
+    def calc_start(self, index: int) -> int:
+        return ((index - 1) * self.BINDER_SIZE) + 1
+
+    def calc_end(self, index: int) -> int:
+        return (index * self.BINDER_SIZE)
+
+def fmt_for_register(number: int, max_int_len: int) -> str:
+    x = str(number)
+    y = str('0' * (max_int_len - x.__len__()))
+    
+    return y + x    # this is what I'd expect y.join(x) to do... but no.
+
+binders_total: int = 10
+binder_index: int = 0
+max_int_len: int = str(Calculator().calc_end(binders_total)).__len__()
+
+calculator = Calculator()
+
+while binder_index < binders_total:
+    binder_index += 1
+
+    domain: Domain = calculator.calculate_domain(binder_index)
+    start: str = fmt_for_register(domain.get_start(), max_int_len)
+    end: str = fmt_for_register(domain.get_end(), max_int_len)
+
+    print(f"Binder {binder_index}: {start} - {end}")
\ No newline at end of file
diff --git a/src/main_alt.py b/src/main_alt.py
new file mode 100644
index 0000000..8c82860
--- /dev/null
+++ b/src/main_alt.py
@@ -0,0 +1,39 @@
+#!~/.pyenv/versions/3.12.9/bin/python
+#
+# Copyright (c) 2024 Cutieguwu | Olivia Brooks
+#
+# -*- coding: utf-8 -*-
+# @Title: binder-calculator
+# @Author: Cutieguwu | Olivia Brooks
+# @Description: Calculates ranges of optical disc binders.
+#
+# @Script: main_alt.py
+# @Date Created: 23 Mar, 2024
+# @Last Modified: 23 Mar, 2024
+# @Last Modified by: Cutieguwu | Olivia Brooks
+# --------------------------------------------
+
+BINDER_SIZE: int = 128
+BINDERS_TOTAL: int = 10
+MAX_INT_LEN: int = str(BINDERS_TOTAL * BINDER_SIZE).__len__()
+
+def fmt_for_register(number: int) -> str:
+    x = str(number)
+    y = str('0' * (MAX_INT_LEN - x.__len__()))
+    
+    return y + x    # this is what I'd expect y.join(x) to do... but no.
+
+
+binder_index: int = 0
+end: str = '0'
+
+while binder_index < BINDERS_TOTAL:
+    start: str = fmt_for_register(int(end) + 1)
+
+    binder_index += 1
+
+    end = fmt_for_register(binder_index * BINDER_SIZE)
+
+    print(f"Binder {binder_index}: {start} - {end}")
+
+    
\ No newline at end of file