diff --git a/src/main/kotlin/com/github/insanusmokrassar/PsychomatrixBase/domain/entities/MutablePsychomatrix.kt b/src/main/kotlin/com/github/insanusmokrassar/PsychomatrixBase/domain/entities/MutablePsychomatrix.kt
new file mode 100644
index 0000000..6082149
--- /dev/null
+++ b/src/main/kotlin/com/github/insanusmokrassar/PsychomatrixBase/domain/entities/MutablePsychomatrix.kt
@@ -0,0 +1,12 @@
+package com.github.insanusmokrassar.PsychomatrixBase.domain.entities
+
+import org.joda.time.DateTime
+
+class MutablePsychomatrix(date: DateTime) : Psychomatrix(date) {
+    private var mutableNumbers = super.numbers
+
+    override val numbers: ByteArray
+        get() = mutableNumbers
+
+
+}
diff --git a/src/main/kotlin/com/github/insanusmokrassar/PsychomatrixBase/domain/entities/Psychomatrix.kt b/src/main/kotlin/com/github/insanusmokrassar/PsychomatrixBase/domain/entities/Psychomatrix.kt
index 2a9dc31..4d7adfd 100644
--- a/src/main/kotlin/com/github/insanusmokrassar/PsychomatrixBase/domain/entities/Psychomatrix.kt
+++ b/src/main/kotlin/com/github/insanusmokrassar/PsychomatrixBase/domain/entities/Psychomatrix.kt
@@ -10,8 +10,8 @@ private fun Int.toDigits(): List<Byte> {
     return "$this".map { "$it".toByte() }
 }
 
-class Psychomatrix(val date: DateTime) {
-    private val numbers: ByteArray = ByteArray(10)
+open class Psychomatrix(val date: DateTime) {
+    protected open val numbers: ByteArray = ByteArray(10)
 
     /**
      * Always array 4*4 of values. In rows was put columns (
diff --git a/src/main/kotlin/com/github/insanusmokrassar/PsychomatrixBase/domain/entities/operations/Operation.kt b/src/main/kotlin/com/github/insanusmokrassar/PsychomatrixBase/domain/entities/operations/Operation.kt
new file mode 100644
index 0000000..d4c767f
--- /dev/null
+++ b/src/main/kotlin/com/github/insanusmokrassar/PsychomatrixBase/domain/entities/operations/Operation.kt
@@ -0,0 +1,240 @@
+package com.github.insanusmokrassar.PsychomatrixBase.domain.entities.operations
+
+import java.io.IOException
+
+private const val oneAsByte: Byte = 1
+private const val twoAsByte: Byte = 2
+private const val fourAsByte: Byte = 4
+private const val fiveAsByte: Byte = 5
+private const val sixAsByte: Byte = 6
+private const val sevenAsByte: Byte = 7
+private const val eightAsByte: Byte = 8
+private const val nineAsByte: Byte = 9
+
+class ConverterException: IOException("This converter can't convert input numbers")
+
+val List<Operation>.canGrowSimpleWay: Boolean
+    get() = contains(SixGrowSeven)
+
+private val operations = listOf(
+    TwoGrowFour,
+    FourGrowTwo,
+    OneGrowEight,
+    EightGrowOne,
+    SixGrowSeven,
+    SevenGrowSix,
+    FiveGrowNine,
+    NineGrowFive
+)
+
+suspend fun availableConverts(numbers: MutableList<Byte>, operations: List<Operation>): List<Operation> {
+    return operations.filter { it.canConvert(numbers, operations) }
+}
+
+suspend fun availableInverts(numbers: MutableList<Byte>, operations: List<Operation>): List<Operation> {
+    return operations.filter { it.canInvert(numbers, operations) }
+}
+
+sealed class Operation {
+    abstract suspend fun canConvert(numbers: MutableList<Byte>, changesHistory: List<Operation>): Boolean
+    abstract suspend fun canInvert(numbers: MutableList<Byte>, changesHistory: List<Operation>): Boolean
+    suspend fun convert(numbers: MutableList<Byte>, changesHistory: MutableList<Operation>? = null) {
+        if (changesHistory ?.let { canConvert(numbers, changesHistory) } == true || changesHistory == null) {
+            doConvert(numbers, changesHistory)
+            changesHistory ?.add(this)
+        }
+    }
+
+    suspend fun invert(numbers: MutableList<Byte>, changesHistory: MutableList<Operation>? = null) {
+        if (changesHistory == null || (changesHistory.contains(this) && canInvert(numbers, changesHistory))) {
+            doInvert(numbers, changesHistory)
+            changesHistory ?.remove(this)
+        }
+    }
+
+    protected abstract suspend fun doConvert(numbers: MutableList<Byte>, changesHistory: MutableList<Operation>?)
+    protected abstract suspend fun doInvert(numbers: MutableList<Byte>, changesHistory: MutableList<Operation>?)
+}
+
+object TwoGrowFour : Operation() {
+    override suspend fun canConvert(numbers: MutableList<Byte>, changesHistory: List<Operation>): Boolean {
+        return numbers.count { it == twoAsByte } / 2 > changesHistory.count { it == FourGrowTwo }
+    }
+    override suspend fun canInvert(numbers: MutableList<Byte>, changesHistory: List<Operation>): Boolean {
+        return numbers.contains(fourAsByte) && changesHistory.contains(this)
+    }
+
+    override suspend fun doConvert(numbers: MutableList<Byte>, changesHistory: MutableList<Operation>?) {
+        numbers.apply {
+            remove(twoAsByte)
+            remove(twoAsByte)
+            add(fourAsByte)
+        }
+    }
+
+    override suspend fun doInvert(numbers: MutableList<Byte>, changesHistory: MutableList<Operation>?) {
+        numbers.apply {
+            add(twoAsByte)
+            add(twoAsByte)
+            remove(fourAsByte)
+        }
+    }
+}
+
+object FourGrowTwo : Operation() {
+    override suspend fun canConvert(numbers: MutableList<Byte>, changesHistory: List<Operation>): Boolean {
+        return numbers.count { it == fourAsByte } > changesHistory.count { it == TwoGrowFour }
+    }
+    override suspend fun canInvert(numbers: MutableList<Byte>, changesHistory: List<Operation>): Boolean {
+        return numbers.count { it == twoAsByte } > 1 && changesHistory.contains(this)
+    }
+
+    override suspend fun doConvert(numbers: MutableList<Byte>, changesHistory: MutableList<Operation>?) {
+        TwoGrowFour.invert(numbers)
+    }
+
+    override suspend fun doInvert(numbers: MutableList<Byte>, changesHistory: MutableList<Operation>?) {
+        TwoGrowFour.convert(numbers)
+    }
+}
+
+object EightGrowOne : Operation() {
+    override suspend fun canConvert(numbers: MutableList<Byte>, changesHistory: List<Operation>): Boolean {
+        return numbers.contains(eightAsByte)
+            && (TwoGrowFour.canConvert(numbers, changesHistory) || FourGrowTwo.canConvert(numbers, changesHistory))
+    }
+    override suspend fun canInvert(numbers: MutableList<Byte>, changesHistory: List<Operation>): Boolean {
+        return numbers.count { it == oneAsByte } > 1 && changesHistory.contains(this)
+    }
+
+    override suspend fun doConvert(numbers: MutableList<Byte>, changesHistory: MutableList<Operation>?) {
+        numbers.apply {
+            if (count { it == twoAsByte} <= 1) {
+                FourGrowTwo.convert(numbers, changesHistory)
+            }
+            remove(twoAsByte)
+            remove(twoAsByte)
+            remove(eightAsByte)
+            add(oneAsByte)
+            add(oneAsByte)
+        }
+    }
+
+    override suspend fun doInvert(numbers: MutableList<Byte>, changesHistory: MutableList<Operation>?) {
+        numbers.apply {
+            FourGrowTwo.invert(numbers, changesHistory)
+            add(eightAsByte)
+            remove(oneAsByte)
+            remove(oneAsByte)
+        }
+    }
+}
+
+object OneGrowEight : Operation() {
+    override suspend fun canConvert(numbers: MutableList<Byte>, changesHistory: List<Operation>): Boolean {
+        return numbers.count { it == oneAsByte} > 1
+    }
+    override suspend fun canInvert(numbers: MutableList<Byte>, changesHistory: List<Operation>): Boolean {
+        return numbers.contains(eightAsByte) && changesHistory.contains(this)
+    }
+
+    override suspend fun doConvert(numbers: MutableList<Byte>, changesHistory: MutableList<Operation>?) {
+        EightGrowOne.invert(numbers)
+    }
+
+    override suspend fun doInvert(numbers: MutableList<Byte>, changesHistory: MutableList<Operation>?) {
+        EightGrowOne.convert(numbers)
+    }
+}
+
+object SixGrowSeven : Operation() {
+    override suspend fun canConvert(numbers: MutableList<Byte>, changesHistory: List<Operation>): Boolean {
+        return numbers.contains(sixAsByte) && OneGrowEight.canConvert(numbers, changesHistory)
+    }
+    override suspend fun canInvert(numbers: MutableList<Byte>, changesHistory: List<Operation>): Boolean {
+        return numbers.contains(sevenAsByte) && EightGrowOne.canConvert(numbers, changesHistory) && changesHistory.contains(this)
+            && !changesHistory.contains(FiveGrowNine) && !changesHistory.contains(NineGrowFive)
+    }
+
+    override suspend fun doConvert(numbers: MutableList<Byte>, changesHistory: MutableList<Operation>?) {
+        numbers.apply {
+            OneGrowEight.convert(numbers, changesHistory)
+            remove(sixAsByte)
+            add(sevenAsByte)
+        }
+    }
+
+    override suspend fun doInvert(numbers: MutableList<Byte>, changesHistory: MutableList<Operation>?) {
+        numbers.apply {
+            OneGrowEight.invert(numbers, changesHistory)
+            add(sixAsByte)
+            remove(sevenAsByte)
+        }
+    }
+}
+
+object SevenGrowSix : Operation() {
+    override suspend fun canConvert(numbers: MutableList<Byte>, changesHistory: List<Operation>): Boolean {
+        return numbers.contains(sevenAsByte) && EightGrowOne.canConvert(numbers, changesHistory)
+            && !changesHistory.contains(FiveGrowNine) && !changesHistory.contains(NineGrowFive)
+    }
+    override suspend fun canInvert(numbers: MutableList<Byte>, changesHistory: List<Operation>): Boolean {
+        return numbers.contains(sixAsByte) && OneGrowEight.canConvert(numbers, changesHistory) && changesHistory.contains(this)
+    }
+
+    override suspend fun doConvert(numbers: MutableList<Byte>, changesHistory: MutableList<Operation>?) {
+        EightGrowOne.convert(numbers, changesHistory)
+        SixGrowSeven.invert(numbers)
+    }
+
+    override suspend fun doInvert(numbers: MutableList<Byte>, changesHistory: MutableList<Operation>?) {
+        EightGrowOne.invert(numbers, changesHistory)
+        SixGrowSeven.convert(numbers)
+    }
+}
+
+object FiveGrowNine : Operation() {
+    override suspend fun canConvert(numbers: MutableList<Byte>, changesHistory: List<Operation>): Boolean {
+        return changesHistory.canGrowSimpleWay
+            && (
+                numbers.count {
+                    it == fiveAsByte
+                } / 2 - (changesHistory.count { it == NineGrowFive })
+            ) > changesHistory.count { it == this }
+    }
+
+    override suspend fun canInvert(numbers: MutableList<Byte>, changesHistory: List<Operation>): Boolean {
+        return changesHistory.contains(this)
+    }
+
+    override suspend fun doConvert(numbers: MutableList<Byte>, changesHistory: MutableList<Operation>?) {
+        numbers.add(nineAsByte)
+    }
+
+    override suspend fun doInvert(numbers: MutableList<Byte>, changesHistory: MutableList<Operation>?) {
+        numbers.remove(nineAsByte)
+    }
+}
+
+object NineGrowFive : Operation() {
+    override suspend fun canConvert(numbers: MutableList<Byte>, changesHistory: List<Operation>): Boolean {
+        return changesHistory.canGrowSimpleWay
+            && (numbers.count { it == nineAsByte } - changesHistory.count { it == FiveGrowNine }) > changesHistory.count { it == this }
+    }
+
+    override suspend fun canInvert(numbers: MutableList<Byte>, changesHistory: List<Operation>): Boolean {
+        return changesHistory.contains(this)
+    }
+
+    override suspend fun doConvert(numbers: MutableList<Byte>, changesHistory: MutableList<Operation>?) {
+        numbers.add(fiveAsByte)
+        numbers.add(fiveAsByte)
+    }
+
+    override suspend fun doInvert(numbers: MutableList<Byte>, changesHistory: MutableList<Operation>?) {
+        numbers.remove(fiveAsByte)
+        numbers.remove(fiveAsByte)
+    }
+}
+
+class GrowCustom()